Why do some players think that land is more powerfull than moon ? Atm the game allow us to rest everytime so natural recovery is close to useless.
The bird forms give the moon druid an incredible mobility on the battlefield and you can have MANY hp with the bear (60+).
The spells are the same, so are the spells slots.
I just started a new playthrough full solo with a moondruid and it looks really doable. Not sure it would be without the bear that grants a LOT of survivability.
What did I miss about the land circle ?
It is the extra spells. Coast gives Misty step as Ash Elemental said, while Grasslands gives Invisibility. Both are solid, versatile spells that druid normally cannot get.
Plus not everyone wants to stop and do a long rest after every fight, so Natural Recovery saves on down time.
