CANON 90D vs CANON R10

Steve Balcombe wrote:

amos roth wrote:

Hello, I decided to replace my old CANON 600D, which I owned for +10 years.

Since all my lenses are CANON / for CANON (18-135IS, 50mm 1.8, 17-55mm 2.8, Sigma 10-20mm), I've doubts about 2 optiion: the CANON 90D, or to switch to mirrorless - the R10 (which is approx. the same budget).

After reading many reviews, I'm afraid the the R10 will be like "enrty lelvel mirrorless camera", as the 600D was when I purchased it more than 10 years ago (of course with update technology), and if I want to step forward to the next level of cameras, than the 90D is a good option, unless I'll pay much more for a mirrorless like the R7 or R.

I'm shooting mostly landscapes, and street photography.

If you keep your cameras for 10 years, it's definitely worth buying the best you can. The R7 would give you the best of both, including 32 MP obviously (very useful for landscapes), and also IBIS (great for low light street photography as well as sharper hand-held landscapes). The mirrorless viewfinders are very similar and both better than the 90D, but the R7's has a higher magnification (1.15x vs 0.95x) which makes it nicer to use.

For landscapes and street, some would automatically point you towards full frame, but before you do that, see this comparison by the always-reliable Chris Frost:

Very interesting video.  I wish there was a version comparing the R10 vs. RP.

But to address the OP’s question in another way:   DSLRs and mirrorless cameras and specifically the 90D and R10 are physically very different in size, feel, weight, comfort/ergonomics (bigger is better?)  and how they appear to people on the street (smaller is better). Another fundamental difference is OVF vs. EVF along with the mirrorless advantages of instant image review and the WYSIWYG EVF image with exposure and focus dialed in while you are composing.    There is no right answer - it’s all personal.   But if the OP has never tried a mirrorless camera, try it! Rent one if you can. That is a fundamental part of making a decision. 
Also, I was in B&H Photo in NY last summer (first time in many years) and had an opportunity to handle the R10.  It really is compact and lightweight. There is a lot of prejudice against cameras made of plastic versus metal or light versus “solid”.  I typically think that doesn’t make sense, but I must say, the R10 did not feel “solid” in my hands. I was using an RP at that time (since sold) and I perceived a difference.  This is totally and completely subjective of course and I suppose any rebel camera is similar, but that was my takeaway. As I recall, the R7 felt the same as the R and RP.