I really can't recommend either, though an S3 at least has a good rep for reliability and MIGHT manage RoI if you have free electric (and Sidehack is working on boards that should upgrade an S3 to competatively current sometime in the next few months or so).
There's a reason Zeus quit selling miners - they never managed to make a competative product, and the ones they DID get made were very inefficient for the timeframe they came out (even their later X6 models couldn't match the Innosilicon A2 machines despite showing up quite a bit later).
Yeah don't bother about the profit, if your miners will break down within a period of just a few weeks.
I know Bitmain is quality but really buying a 2 year old miner? Why would you do that?