Re: Evans G2 Clear v.s Evans EC2 SST Clear
I find the EC2s provide a bit rounder note with less attack. I would not necessarily think of them as pre-dampened, exactly, but the ink rings do smooth the sound out a little bit. I am currently using them on my kit but will likely not use them again because I want a livelier sound with more bite.
Speaking for myself, I would not put rings on either the G2 or EC2. Properly tuned, those overtones are part of what keep the drum from sounding like cardboard to the audience. Tastes vary, though.
Short answer to your question - I'd go with G2s.