Anemone can live a very long time, if not indefinitely. If I didn’t have gigantea, or couldn’t find any, I would look for H. Malu for a couple reasons. They stay in the sand, I haven’t seen any much bigger than 8-10”, and they aren’t super sticky like carpets. Most clowns typically will take them. They are more difficult to acclimate than BTA, but once acclimated, the ones I’ve had are pretty resilient. Once they find a spot, the ones I’ve had, never wandered. BTA like to take a walk when you least expect it. Malu can have some very attractive coloration too, with strong light. Carpets like food (fish), so if your tank is smaller, expect that fish might go missing. There’s a couple strains of purple Malu that to me are stunning in color. There’s some nice greens too.
IMO, Malu are under rated. Probably one of the best reef nems, but they need a DSB a few inches deep.