In my experience, ETH is accepted by more providers I use than ETC but according to my latest information mining ETC is more profitable than ETH in the market. I count on ETH a bit more for the future but I appreciate ETC, too. Why not mining both? I prefer medium-term investments in ETH, but my current focus is on ETC.
If you are a pure miner just for the mining profit, then you can mine whichever is more profitable and sell it after the mining.