Like everyone said pretty much personal pref. I am partial to Burton boards, Burton boots and Union Bindings (Lifetime warranty on baseplate and heel cup. Plus union is a binding only company so it directs all its energies and resources towards just bindings resulting in some of the best bindings to ever see snow imho)
Union may try to make the best bindings but it doesn't mean they make the best. All because a company directs all its resources toward one product line doesn't mean it results in the best. Larger companies probably have more resources and larger r&d budgets.
I was recently trying to find the same information. Everyone says Burton is the best but I really think it is all up to what you believe and what you ride. So for me K2 and Ride are the best. I did find a nice site though that talks about a whole bunch of different brands. It was here. This helped me a lot I was doing a paper so it has a lot of keys facts. Hope it helps.