Don’t buy the Presonus Atom. That’s a popular one that many people regret buying for EZD2.
It would be pretty difficult to buy a midi controller that doesn’t work with EZD2. My number one suggestion would be, whichever controller you buy, make sure it can map the pads since EZD2 cannot do midi mapping.
To get better feedback, you’d be better off figuring out which controller you’re interested in, and posting that… since there’s an infinite amount of options. I use Native Instruments keyboards and cheap Korg controllers, all work fine.