Depends on the content. For popular crap that I'm probably going to delete later I generally go for the 10-15GB option as finding a decent rip at a lower file size can be annoying (Latest marvel movies, etc). If something is sufficiently obscure or visually stunning I'll normally keep it at 10-15GB rips depending on the source material (Obscure horror movies, Dune). For regular stuff that I still want to have a copy of but that is popular enough I'm not worried it's going to disappear I go for the smaller versions (The expanse, adventure time).

Right now one of the biggest things on disk are a bunch of Boston Legal episodes. I have family that enjoy it, and I'm too lazy to find a good small release so it's taking up more space than it needs to.

I try to get HEVC encoded video where possible, and when I know there's a particular release group that produces high-quality I'll set up tags to prefer them.