It truly comes down to how do you want to structure your daily life in your rv?
Are you fine with smaller, if so get it :)
Do you need some elbow room just for yourself to feel good in your space? Make sure you buy some extra space for yourself then.
We were tent campers originally in the way younger years :)
So we did fine with small spaces. We were ok with minimal amenities we brought.
Then the size upgrades---Truck camper to 28 ft TT, 34 ft TT with slides, a few 5th wheels at different sizes and then the biggie, a 40 ft toyhauler 5th. AND we realized as we got larger it never made us happier truly. it was just a monster and a pain :) (for us)-----so back down we went. To the 'smallest' the 3 of us are comfortable in....a total lenth 34 ft toyhauler trailer. box is 30ft. and that is the smallest we will go for the 3 of us. We also do not do private cgs, we are COE, state parks and national parks. We fit fine. The floorplan of this new toyhauler suits us great. We are happy as clams with this smaller set up...losing 6 ft seems dramatic, but in the end we don't notice it truly.
So find a floorplan that suits you, be sure if you want to stick with a size for easy convenience etc do not keep going up in size if not needed.
We can overthink for sure :) Hubby said 30 ft total max length! NO way I could make that work comfortable for us 3 and how we function in an RV and our camping lifestyle. We ended up with 34 ft total length. But our eyes kept going to bigger models, 36 ft total, 38 foot total and since we wanted WAY smaller than our 40 ft monster, it was imperative we stuck to our guns and kept it as small as a floorplan that suited us.
Look around and see what will suit you and stick to your guns and get what you need and want :) You can't go wrong just buying what feels best to you.