Jds labs

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 opportunity to buy 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 for me? I have an ndh 30 as a headset and a prismsound Orpheus as a sound card, many thanks in advance.