Clearly, the answer is to buy all three!
But seriously, the best idea is to try them all and figure out which one you like best. If that's not an option, figure out what's most important to you and pick the one that fits your choices best. For example, I really dislike trem bridges, so I wouldn't go with the Studio, and I prefer bird inlays over dots, so (depending on the year) the Vela would be out for me as well - not to mention that I already own one. So I would go with the Chris Robertson SE (coincidentally, I suddenly have the urge to buy one of them now).