We always try to do my best. If higher on the list at https://ethstats.net/ That means we establish better connection between ETH netowrk and our mining pool. As a result - you can reach more coins, lower uncle rate.

We maintence servers in Germany, Poland and Finland. That's why we can be at the top of most efficient mining pools.
It concers all mining pools:

ETH
ETC
EXP
UBIQ
MUSIC
PIRL