I've found both to be quite hardy and easier to care for than ritteri's and sebae's. BTAs are much more likely to host clowns than any other anemone with maybe the exception of the ritteri (H.Magnifica). I'd probably start with a BTA if you want to get a clown to host it. PJ Cardinals have also been known to host BTAs in the wild. (Not sure if it's happened in captivity).
The two anemone's in question require a lot of light. 250w MH
, 4+ T5 bulb fixture, quality LEDS etc. Both would do well in a 30g+ tank. They also require as good to perfect water as you can get. Even still, they are more forgiving than the more sensitive anemones.
Folks have recommended to wait at least a year before adding an anemone. Obviously the longer the tank has been around, the more stable it is. Personally, I've never agreed with this. A stable tank is a stable tank; regardless of how long it's been established. A more established tank is no doubt able to cope with bigger swings but with good aquarium husbandry skills, regular water changes, good filter equipment, and plentiful lighting adding an anemone before this 1 year mark is very doable. It's a personal choice and one that I'm happy I made. Before adding an anemone though, think about your abilities to care for its special needs and the animal iteself. If you haven't been able to keep your tank parameters stable, odds are an anemone will pose a much harder challenge. Good luck!