Reply to Best Virtual Synth For Dubstep Wobble Bass

So, I've Started making a lot of dubstep music and I'm wondering what you guys believe the best virtual synth for the wobble bass is. I'm currently using the ES2 Synth found in logic. I'm considering picking up a copy of reason or maybe massive as I've been told they are, and there are better choises than the ES2. Any recommendations?