For Strat you will need at least 1 char to clear all the diseases you get. If you are just farming orbs I would say MMMMP is fastest. I would also say:

1. Horde is way quicker to reach 60 due to easy SM access and Gorshak farming. I pretty much leveled from 53-60 no risk easy peasy on Gorshak. So much so that I gave up on my plan of an alliance team.
2. Prices on Ally side are lower. I probably shouldn't give this away though.
3. If you are grinding world mats like essences, I would think a hunter team is fastest with the least down time. The biggest reason hunters kind of suck for instance farming is the deadzone, which doesn't come into play in world farming at all.
4. Mixed team are harder to manage. Something like LMMMP will give you soulstone and summons, it's much easier to manage MMMMP.