i have compared zpool and starpool, mined 10 hours with same power.
At the end of experiment: zpool payed me 10 coins more!!! (ALGO: X11, Coin: Monoeci)
Any explanation from pool owner about this difference?
Zpool just had better luck that day. The luck factor is huge and any pool can have a good or bad day. They don't synchronize across pools. Usually if one does really well the others do less well if they share similar coins.
think your analogy is correct. perhaps starpool have a more stable coin set(exchange value)for x11/sha/scrypt would explain the earning rate(hourly on awesome miner) compared to zpool thats erratic sometimes showing high numbers but then dropping off couple min later.