definitely the easiest of the carpets, but IMO a BTA is much easier to care for.
most people lump all of the carpet anemones together, but theuy all have very different needs. HAdoni is pretty easy to care for, but there are reports of eating fish. S.gigantea is not nearly as likely to eat your fish, but they have one of the worst records of survivability in our aquaria. They have very specific needs that are far different from the hadoni. S. mertensi, simply gets HUGE. Too large for most tanks.
gigantea = 22"
hadoni = 28"
mertensi = 36"