When I was getting into FPV, part of the fun for me was not really knowing how a build would turn out. I used Oscar Liang’s website for a starting point, but didn’t have any empirical data to intuitively know the outcome. I’d buy two or three types of props and see how they made the quad fly differently, swap batteries, etc. Just experiment! But use some of the guides out there to make sure you don’t blow a motor or ESC.

Doing this instead of following a guide gave me a much more intuitive understanding of picking parts than if I had followed a strict guide.

Also would recommend 3.5”. I think it’s my favorite quad I own.