2. Can you trust him
3. Is he devoted to what he does
A good reading on topic from a person who is devoted and trustable in my personal oppinion. Do not take this as a recommendation. There are others like him, but in a post below same thing is explained from first hand.
https://bitcointalksearch.org/topic/m.11911672
And another one from a guy which does not need an introduction at all!!!!!!
https://bitcointalksearch.org/topic/m.11791194
And so on and on
And you will chose a China pool just because of some "imaginary" profit..? That is f...ing pathetic...
AND LATER ON .
Important things to look out for:
1. Pool fee
2. Does the pool payout the transaction fees to miners, not just the flat 25BTC.
3. Reward type