I'm leaning more to the J235, mainly because I like the dealer better. There's not much difference in price:
J235 - $5999 includes cover, initial chemicals, install
Relay - $6100 includes cover, stairs, initial chemicals, install
And I've seen the J235 filled and in action (though I haven't wet tested it). The Relay, I've only seen in the brochure though they have other models on the floor (or rather, in the back of the warehouse).