Having tried both, I can say that the JOs were super light (almost too light, I felt like there was nothing underneath me, kinda uncomfortable - however these were the 07s which were foam core so they might feel different now since the 2010s and beyond are wood core), they were awesome on jumps, but rails were meh, they were really stiff so buttering was almost out of the question and I didn't feel very stable on rails (although swaps were so easy cause they were so light). I did finally get a chance to try out some alphas, they were fun, buttering was easy, they held their own on jumps - it was weird at first taking off switch, but after I got used to it you could take off switch in full confidence that you wont catch your tips, on rails they were pretty fun too, presses were easy and I felt very stable doing nose presses in particular.
If I were picking, I'd go with the Alphas, I had more fun on them than the JOs.