Depends. If you really love a certain type of anemone, I’d research natural symbiotes to pick the species most compatible with that type of anemone. Whereas if there is a certain type of clown you really want, then I’d research what its natural host anemones are. You are most likely to get a successful pairing with natural host/symbiotes.
The most commonly kept anemones (and one of the easiest species to keep) is the bubbletip anemone (often denoted by the abbreviation bta -bubbletip anemone or rbta -rainbow bubbletip anemone). But I really like carpet anemones and magnificas (aka ritteri). FYI, Mags are probably the most difficult anemone to keep.
Here’s an article with info on clowns and host anemones. There’s also a clownfish and anemone forum on this site.
Not all species of clownfish will set up a home in any type of anemone. Certain species are more likely to be compatible than others.
www.thesprucepets.com