And what's the problem ?
The moon druid looks pretty powerfull from 1-4 and I read a lot of people saying that land is even more (not my feeling but anyway).
The problem is land druids get the same forms and also get additional spells. Moon druids can shape shift with a bonus action but that seems like a bad trade off.
Land druids should not have equivalent forms of moon druids. They are designed to be more spell casters.
Honnestly the bear is really better than any other form according to me for its 30 HP + its 21 strenght.
The other forms are good in several situations but I never used them in combats (except sometimes the badger to move, but it require 2 actions if you're a land druid)
The bird is not that much because you can't transform (bonus action) + jump (bonus action) in the same turn so it's incredible mobility is not really usefull in combats.
The bonus action instead of action is a huge trade off according to me.
2 * 30 HP as a bonus action is like many healing potions and you still have decent damages (2D4 +5).
You can use your action for whatever you want + get those 30 HP.
And because it costs nothing to go back to your normal form, if your bear has something like 10 HP left... You only use a bonus action to get 30 HP again (using your action between the 2 forms if you whish).
Maybe at higher level it will become a problem but seriously atm I don't think it is one at all.
On the other hand land druids are supposed to be better spellcaster but they don't have more spellslots. They have powerfull spells that gives them another versatility but honnestly I think both are pretty well balanced with their own PRO/CON.
