haha, use the turf putting green for the summer set up, now you got both.
I'm just kidding, that's a tough choice, I guess it depends on 2 things:
What do you like to do more - rails or jumps
What do you want to get better at more - rails or jumps
Personally, I'd go with the summer set up cause at least then you're sort of skiing, while the tramp is super fun, you're not really skiing, you're just jumping on a trampoline.