Not sure which one the best ( theres a few to choose from ) but I would look at what you want to get out of a multi tool.
It depends on what you want on it I think, I like the idea of having a small saw as part of a multi tool, but that’s just me.
I’ve got a Leatherman Blast which is good and also a Leatherman micra for a key ring, they`re ok and do the job just fine for me.
I also have a Victorinox SwissFlame Swiss Army Knife .which has come in handy more than a few times
http://www.youtube.com/watch?v=Pts5MRJk1sY