Honestly "best" pool mining NAUT is kind of hard to say. Once in a while TradeMyBit's multiport points at NAUT and completely slams the network (ranging from 10MH-1GH, but I don't know the direct NAUT port there. IPO Miner has a direct port to NAUT, and 0fee pool also usually has an okay amount of hash pointed at it. Bitember has a few and a few others do, ultimately hash distribution seems overall really even, no one pool is significantly greater than another.