Sorcerer benefits you in the short term because they should reach some of your desired stats early on. However, for example say you were going to build a mage @ soul level 120 the pyro will reach the kind of stats for a mage the fastest out of all the classes. For the sorcerer they tend to be higher then SL 120 (A few extra soul levels to achive the same desired stats) when they finally get your desired stats. So long term pyro wins.
"Stop being so good!" - darksydephil PSN: Evil_Nikran