I hope I can help, as gone through the same dilemma! ;-)
After a positive 2 years spent with the Lumix TZ 202 as main holiday camera, I bought recently a used RX 100 VII which came with the optional Sony grip.
Without grip is impossible to hold it securely, but although this grip helps for sure, my hand feels sometimes cramped.
I did some intense but subjective testing side by side for my usage as a travel and go-everywhere camera.
- The RX customization is not easy to understand and the RX menu is (for me coming from Lumix & Canon) strangely organized with several levels into the depth. A full pdf-manual for the RX 100 VII is difficult to find on the internet and after finally finding a link, the next best language for me is in English. Via the Sony standard site you find:
https://helpguide.sony.net/dsc/1920/v1/en/index.html
In addition, I can recommend "The White Book" to set up the camera step by step.
Once it is configured to individual taste, the Sony works very well.
- The AF system of the TZ is very good, the one found on the Sony is outstanding! Especially the various AF auto-modes work very well and subject tracking is lightning fast!
- The Lumix and my Canon cameras seem easier to change settings without having to use a manual.
The touch screen in the Sony is only used to set AF point.
The rear screen of the TZ is fixed but it can be used to modify settings like a smartphone touch. It is bright enough in daylight and even over head shots are possible.
The flip screen of the Sony add more significantly more flexibility to the overall usage of the camera.
- The TZ handles slightly better than the Sony.
- Battery life is noticeably shorter on the Sony than on TZ 202.
- What I like is that the viewfinder of the Sony works a lot better for me when wearing glasses. It has a slightly larger view, too.
- The IQ of both cameras is already on a high level, but the RX is overall better, especially towards the corners.
However, the Sony is not as good as the TZ when shooting macro like close-ups. The TZ can magnify several times more (3-4?) due to nearer minimum focus; this may be important e.g. for flower and insect shots.
- The Sony can be used with optional filter holder the TZ not. I installed one to use a polarizer and ND filter.
- I could not detect any significant difference in noise or dynamic range between the 2 cameras yet, but the Sony seems to have a slight edge due to wider base aperture and new (stacked) sensor.
- The first looks at the images from left me uncertain, but after a few more rounds to me the the Sony seems to be the clear winner if IQ is more important than focal length (200 vs. 360mm)!
The stats of my TZ images of approx. 3000+ shots are
- 820 at 24mm
- 100 at 200mm
- 350 at 360mm (many close-ups and detail shots)
- other focal lengths in between, single to double digit counts but <50 at maximum.
Resume: I like the handling and the focal length of the TZ better, but the Sony is the better photographic tool (for me).
Maxmolly7 - thanks a million for your very extensive reply and brilliant that you could compare & test both camera's.
So if in the end I favour the Sony I alson need to get the grip for better handling - good to know

. I do not have massive hands but like a good grip on the camera.
Good to know that indeed the Sony menu is not as intuitive as the panny's (had an Olympus before the Panny) and found both equally intuitive. Guess that means getting to grips with and studying on the Sony menu.
Brilliant the link you provided to help set-up the camera properly and the title of a book book to set up the camera step by step. saves me having to find it all out

. You say that "Once it is configured to individual taste, the Sony works very well." - so I take it that their atre a few custom menu's to be set up - ,like on the Panny (set1,2,3)?
"Especially the various AF auto-modes work very well and subject tracking is lightning fast!" this I like a lot, since I tend to take a lot of animal photos when travelling.
It is a pity that Sony only uses the "the touch screen to set AF point I like the fact that on the panny you can use it to set various menu settings. i guess if it will become the Sony I just have to deal with it

.
That is a downer that battery life is not so good on the Sony - is it possible to use "stronger" batteries with the camera so eg a 1350Mah battery instead of the original 1240Mah one?
Good to know that the vieuwfinder works very well with glasses since I wear them too.
So Sony no soft edges - nice to know whereas the panny is better for macro since it gets closer. To me this is less important than no soft corners - I do take macro shots of flowers and bugs but not so very often. Or if I do take them I also often use the telezoom.
Good that you mention that the Sony can be used with a filter for I do like to have one on the camera as lens protection. I assumed that for camera's that would not be possible.
"I could not detect any significant difference in noise or dynamic range between the 2 cameras yet, but the Sony seems to have a slight edge due to wider base aperture and new (stacked) sensor." - good to know that you did not spot any differences in noise or dynamic range but that maybe Sony is slightly better due to the wider base aperture and sensor. I had a feeling this might have been the case - so nice to know that my hunch was correct.
I like a good IQ a lot especially, since this will be a trip of a lifetime - hence my search for a replacement for the 2500 so that I can get familiar with a new camera before I leave. Though a good focal length is also important to me to capture far away scenes - or is it possible to use a photoprogramme to get decent results of cropping parts of a photo on a computer later on?
Makes you want to wish that Sony & Panny would combine the strenghs of their camera's and combine it to create a camera together in which all the strong suits put into one. Guess that will remain wishful thinking.
For now I think the Sony wins, though I still have to put the pro's and con's in a list and find out which comes out as best for my needs. Thank you for putting me on a good track. For now it seems as if Sony might come out on top even though it has a more complicated menu structure, slightly more difficult handling & less zoom but like the no soft edging, brilliant AF tracking, possibility of using filters & very good IQ.