FALLOUT 3: NEW VEGAS. Help me decide who I should side with?

If you play Wild Card (Yes Man), then you will have the most freedom to attack or side with teams (e.g. Wild Card is the only one where you don't have to destroy the Brotherhood of Steel). And if you go NCR then all the towns get taxed. But really it's your choice, but in Wild Card it is you doing things, not taking orders.