Yes it is noticeable.

But in my experience (and I’m a sucker for HRR) on a phone it’s not absolutely needed, if the savings are worth it.

About the CPU, don’t even bother, the A16 is a small step up from the A15 and even an A13 is still plenty fast for almost everybody. The RAM is more important and both have 6gb.

Up to you really. Try getting a hold of both on a store, because the Pro is way heavier also. Bear in mind that side by side, the 120hz will be even more noticeable, but your eyes will adjust to 60hz or to 120hz in a day, wathever you buy.

Good luck!