There are a few threads here on mustache bars with a range of opinions both pro and con. I tried them for a while on my commuter, but didn't like them. I prefer drops, and no hand position that other bars offer is more comfortable for me than up on the top corners of drop bars. I haven't tried porteur bars yet and I think I might give them a go.
Mustache bars turned out to be less than ideal for a 30 mile trail ride:
