I wouldn't worry about the "limited" 6GB RAM myself. Android updates do not necessarily mean that you need larger and larger amounts of RAM: my Pixel 2 has gone from Android 8 to Android 11 with no noticeable impact on performance, and it has 4GB of RAM. My daughter says that her Galaxy S8 (2017, originally Android 7, now Android 9) still runs fine and it too has 4GB. I do personally feel that part of the drive towards ever larger amounts of RAM is marketing: sticking a bit more RAM in may make more difference to sales than it does to usability. The biggest impact is likely to be on how many apps can stay in storage without having to reload when you switch back to them, but if you are a light user how important will that be?
Now that's not to say that a manufacturer can't release a badly-optimised update which slows things down, but it's rarely the lack of RAM that is responsible for that, just poor coding.
So sorry, that doesn't answer your question, just to say that if it were me making the decision I'd not worry about the difference between 6GB and 8GB of RAM.