They seem more or less the same in terms of, ahem, squishyness. However it does seem at least for now, that Wizards have more builds to choose from. If you are not so hard bent on Intel chars, than pretty much any other will do much better. I would first go and play some range classes to make my transition as smooth as possible, like Demon Hunters. But to give a decent answer we first need to know what you plan to get out of them, either you want to play as casual as possible or as efficient as possible. Because believe it or not, not all classes/builds can manage both!