BobaMaker's helmet is ready to paint when it comes straight out of the box, it's perfect, I love it. Now when people say it is "ESB Style," What they mean is it has the wavy brow and has the flared shape of the ESB. I'm an ESB Fett so it works perfect for me, I have his helmet and I love it. The helmet is crisp, detail is great, it's an all around solid helmet. The only downpoint to the helmet I believe is the weight, it isn't heavy, but definately heavier than the SgtFang bucket.
SgtFang helmets are mediocre when they get to your door. They require a lot of cleanup and some flaws just can't be cleaned up at all. Such as the "lump" on the right side of the helmet's dome. It can be removed in theory, but I never thought to sand it down that much in fear that the resin would become so thin it would break to the touch or just create a hole anyway. This error isn't huge, but I don't like it. The helmet has also been recasted so many times a lot of detail has been lost, especially in the dent. The one think I really liked about the helmet was its weight, I'm not sure what kind of resin SgtFang uses, but I want the recipe.
Your budget should really define what helmet you get. If you can buy a BobaMaker, I say go for it. However, if you have a BobaMaker budget, it doesn't mean you have to buy from him. SgtFang still makes a good bucket that can be used by most everyone. Size-wise, the helmets I believe are just about the same.