Doing a little test comparing Wafflepool with Middlecoin.
System 1: 888 kH running on wafflepool (818.1 WU/m)
System 2: 1465 kH running on Middlecoin (will update WU/m later today)
Dates: from the 9th until today
Location: EU, both are using closest servers and so far basically no downtime (at least nothing that I've noticed on either) on either pool during this period.
Results so far in daily earnings per MH paid to my BTC wallet:
from the 9th until today
Wafflepool: 0,012400744
Middlecoin: 0,012222466 (forgot to take note of unexchanged)
from the 12th until today
Wafflepool: 0,012275473
Middlecoin: 0,011666822 (took note of unexchanged

)
My BTC address so you can compare on your own:
http://www.middlecoin.com/reports/156hqodvbN4ugtnYMMc87c71pjRqBzPxub.htmlhttp://wafflepool.com/miner/156hqodvbN4ugtnYMMc87c71pjRqBzPxub#I will run this test for another week or so, but so far waffle is showing slightly higher earnings than MC does. If anyone spots anything wrong with my calculations please let me know, the data is there for you to check. This increased earning seems to do with me getting about 8.5% rejects on middlecoin + its higher fee, whereas my rejects on wafflepool is 2% and 1% fee. So it does seem that middlecoin seems better in terms of mining coins during the period I mined, but that its higher reject and fee make the overall profitability lower. The overall difference is very low though, and wafflepool is better looking imo ^^. Basically, it seems that profitability is determined by what works for you.