X-Keys preference?

I'd go for the X-keys pro. I had one hooked up to my RVI and I was able to map many of the keys 1-to-1. Some of the others you have to kinda make up where you want, but it also depends on what you're doing with it. 

X-Keys Pro for sure.  If you want to do a lot of offline or client work, keyboard shortcuts are a pain.  ETC provides already built keycaps for ION/EOS, but it's easy to make your own.

X-Keys Pro for sure.  If you want to do a lot of offline or client work, keyboard shortcuts are a pain.  ETC provides already built keycaps for ION/EOS, but it's easy to make your own.