Depends on what you're going for, beauty or playability? Xenon is gorgeous, but not much of a player. The opposite can be said of Gladiators. Gladiators has some fun modes and even a small wizard mode, which is quite fun; pretty easy game that beginners and non-pinheads will like, with some great shots. I have had them both at one time (owned and fully restored a Xenon and shopped out Gladiators for a friend). In a small collection, you'll get more enjoyment out of the latter, but if you're into the early SS Ballys, Xenon isn't a bad game to own.