I have no experience with either. Having said that, I'd buy the one I could get several extra breech plugs for.
The Genesis has a good reputation but has been out of production for a while now.
Did he buy extra consumables? If you get it cheap enough you could have some fun regardless!

"Camping places fix themselves in your mind as if you had spent long periods of your life in them.
You will remember a curve of your wagon track in the grass of the plain like the features of a friend."
Isak Dinesen