Control wizard is theoretically a wizard who focuses more on the CC aspects (Orb gives a penalty to saves in 4e) versus a war wizard who focuses on the AoE blasting (wand gives a bonus to pewpew), but since I doubt they're going to go make an alternate wizard anytime soon when they could add more variety like Ranger,…
At the same level, the blue item will have more stats than the green item, but it doesn't seem to be that much more, because a green item like 6 levels higher seems to start to outclass the blue item. For example, you might see something like (numbers made up): Belt of Goodness (green) level 40 +50 power +50 crit Belt of…