User blog comment:Mythical zoan fruit enthusiast/I'll never forgive you!!! Unless.../@comment-5962458-20130810160714

Tough question, but if you look at it the other way around (who of those two would make a temporary alliance with Luffy) the answer is only Blackbeard. Blackbeard is not nessessarily an evil person and he would mind being even friends with Luffy if only they didn't share the same goal. Akainu on the other hand wouldn't walk on the same road as Luffy even if his life depended on it.

Saying this, i believe Luffy could fight alongside not in a cooperative way though) Blackbeard if they face a common strong enemy. Afterall, Ace lost to him fair and square and deep down Luffy knows that this could happen in the path they chose.