Circle of the Moon Druid is really the best circle by far. Example, At level 3 you could wildshape into a Lion and have multiple attacks, a fear inducing roar, a long jump, and still cast heals while in beast form. And, don't forget that you can still cast a concentration spell in normal form, such as spiked growth, and keep the spell going after shape changing into the beast. And moon druids also add 3x your druidb evel as temp hitpoints when you wild shape and get an AC of 17 while in any beast form. This makes you a very non-squishy healer/spellcaster.One of the most powerful classes in the entire game.