MarkNewman87

ICC profiles are not LUTs. However, they may (or may not) contain one or more mapping tables which are similar to LUTs.

As I understand, the All Films 5 profiles are in sync with the mobile app looks: https://reallyniceimages.com/products/rni-all-films-5-pro-for-adobe-lightroom.html#product-comparison But in LR they ...

That depends on the product I guess. The "old" RNI Films 4 is just a preset-based solution, i.e. they look good too but they just preset the channel curves and sliders to emulate film stocks. And ...

I use RNI a lot, some of the best film profiles out there in my opinion. But at the end only you can decide, everyone's taste and style are different.