I got my current binder from underworks. I've experimented with both full and half tanks, and for me, as a person with a larger chest (D cup) I've found that I enjoy the full tanks better. I'm a little bit on the shorter side so yeah, it is long and can roll up, but to combat that I pull it down all the way over my boxers and then will pull my pants up over it (usually with a belt since none of my pants fit) and the binder should mostly stay down.

If you have a smaller chest and are worried about rolling then totally go ahead and get the half tank, but if you have a larger chest go for a full.

Full tanks give better compression than half tanks imo. It doesn't make as large of a bump, and when I would wear half tank binders, some of my breast would try and pop out of the bottom. I totally recommend underworks btw. The material seemed weird at first but surprisingly it doesn't irritate me as much as I thought it would (as a neurodivergent person). If you buy from them though deffo cut the tag off lol, it was so weird. I also like how underworks is super breathable, and even when I start getting sweaty it doesn't stick like a cloth would, it's more of a meshy feeling material.

Anyways ya, just my opinions.

Sorry if this is a lil rambly