We're looking to make more class-restricted items for both classes, especially with the addition of the items locker. At the moment, the wizard's does have one class-restricted item, the Spellbook, a rare find that gives you an extra skill point.
In addition to the core bonuses (e.g. +1) there is one special wand type to be found in the game, although it's equally useful to both. Having the ranged weapon to start is a huge advantage for the wizard, especially if she also has teleport.
Personally I've found myself playing Crusader much more than the Wizard, but usually with games I charge in guns blazing, so I'm more likely to prefer the class that can take the few extra hits. My boss always picks the Wizard, though, with decent success, usually. *shrug* The Gameplay Strategies thread has some really good suggestions on how to play the wizard, including a skill loadout I've been meaning to play that centers around her crystal balls.