I started off using ethos. It was great and super easy to configure, not to mention super stable! But using windows 10 and claymores miner allowed me to make tweaks such as overclocking and undervolting the GPUs to get the best possible performance (an increase of 5-6mh/s per GPU). Something ethos really couldn't offer.
RE: Nicehash , Claymore and EthOS – What are they and which one should I use?