Technically there is no best barrel, in fact there are several equals, most of it will depend on your opinion, (ie. even thoughthey are both fine i like SP over Dye barrels), most important, think about what bore size of paint u usually run, (small bore tend to b more towards competitve paint.)
You must take into account what your length should be, if you want it shiny and flashy, and how much porting you want.
(keep in mind while porting can make a barrel look really cool, it can make it a pain to clean. And while a billion porting holes may make it quiet, it might cause a loss in air efficiency; Im not totally sure exactly how porting will effect your efficiency though.)
And of course there is the biggest-est, most deciding part of your barrel:
Can you hit the broad side of a barn with your old barrel
So, in conclusion just shop around for the best prices and what ever your looking for, may it be inserts by the dozen or a simple one piece barrel, there is always a "perfect" barrel out there for you.