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Best is all a matter of one's opinion. Personally I don't stick to just to one company, I buy from any company that makes a good qaulity product.

The only company in Paintball that produces just about any item you will need to play I think is Empire and then next in line is Dye. So if your going to be a major fanboy for just one company I'd have to say those two are the ones to go with.

As Draxxus said, it all boils down to personal preference. Empire makes everything you need to play but the quality of their products isn't the greatest. Dye mayes excellent products but, at the same time, jacks their prices way up. Eclipse is probably the best company when it comes down to performance and pricing. The quality of their gear is amazing and most of their products are affordable.