So here is a little comparison between middlecoin vs hashcows..

 Middlecoin BTC per MH/day through the last 12 days
    .02013 BTC TOTAL // 0.0167 per day avg

 Hashcows BTC per MH/day through the last 12 days
    .02354 BTC TOTAL // 0.0196 per day avg

 That is a difference is approximately 16% over the 12 day period from my estimates..