The other alternative is the open source ethminer program originally made by the eth foundation and improved by Genoil. Its free and exact same speed as claymore.
However it sometimes freezes, and if 1 GPU crashes it stops the entire program so no GPU is hashing until it gets restarted.
Every calculation with my pool/wall measurements i make shows dual more profitable, even with 2+1% +1% DCR fees, at least on my green rigs switching dual/single makes little to no change to ETH MH/s choosing right intensity.
Maybe i am miscalculating though...