I have yet to shoot the Bull Barreled model. Personally I like heavy barrels, and find that I get better accuracy out of them. Not always, but more than not. There are many reasons for this, but no need to go into that right now.
Anyway, if you are a reloader(which it sounds like you are
) Then I personally would go for the heavy barrel with a 1-10 twist. More reloading options are always a plus in my book. As kjeff50cal pointed out.
But too it depends on what you want. If you want a good little shooter to plink with and carry around, then the regular model should suit you well.
If you don't plan on moving around all that much with it, and want better accuracy plus more reloading options, then the Bull Barrel would fit the bill.
Toss up for what you want.
-Aaron