It depends on how you like to play, IMO. Blasters are the truest of the glass cannons, pure damage with perhaps a few disable/debuffs thrown in on the side. Corruptors tend to be more versatile, since their secondary pools have a wide range of disables and supportive boosts in addition to the standard ranged damage primaries. I'm more fond of Corrs myself for that reason, though blasters are better at dealing ludicrous amounts of damage, handy when you have a tank around. Corrs are a bit more sturdy and tend to shy away some damage with either heals or heavy debuffs. Best way to decide is to try both, see what you like more.
