You gain presets lol. And in the case of odyssei it has a ton of additional features including a sequencer and full effects bank!

Experiences vary but sliding a slider on a screen is worth the benefits.

In the case of ODDYSEi, I am not sure whether the included 6-controls sequencer [i think that’s called P-lock] and/or the desunion on 8 « channels » [not sure of the wording] also exist somehow as hardware devices for the real ARP Oddysey