Of those, I'd choose the Big Stik 40.

My brother had both and preferred the Big Stik over the Ultra Stick. He got caught up in the "gotta have quad flaps" frenzy and bought the Ultra Stick. He used 'crow' a few times then got bored with it. He programmed the flaps to work as full span ailerons and liked it better, but he never liked it as much as the Big Stik.

When I decided to get a stick model, my actual choice was Big Stik 60.