Quel ampli casque choisir ?

Hello dear gearspace community, I am calling on you for your expertise.

I'm about to buy a headphone amp for mixing. I have the possibility of buying a JDS Labs EL Amp 2 for 160 euros or a JDS Labs Atom Amp 2 for 210 euros. Is there a difference in quality between the two, which one do you choose?

I have an NDH 30 as a headset and a Prismsound Orpheus as a sound card, thank you very much in advance.