Lvl one witch has 25DPS 75HP and LVL 5 wizard has 170DPS and 156HP. Therefore, I think that witch is a lot stronger by 6.8xDPS and 2.08xHP. In consideration of the 10min time diffrence to cook and the price difference, the witch has a way higher rate of magic damage as it distributes faster bolts and re-animates skeletons. Though you can have more wizards in your camp, one lvl 1 witch will do the work of 8 lvl 5 wizards without a healer helping. Neither are front line troops.