Both. Sorry to be so unhelpful, but I haven't played either. Warwicks are excellent instruments though and I'm sure you'll be happy eiher way. I would AB them if that is possible, and if it's not, buy them both, keep your favorite, and I'll take the other one off of your hands free of charge.
I just took a look at each of them from Warwick's website, I gotta say I like the Infinity better, just my personal preferance. (forum won't let me vote, seems I'm invalid or something... hmm)
What sound are you looking for???? I would say the jazzman's pickup configuration is more versatile... lots of sound options. I quite fancy adding a jazzman to my collection