Well...the reason there are so many is people have differents ideas of what bbq sauce should be. CI
rated them awhile back and Bull's-Eye Original won their rating. I keep a bottle of it on hand, but generally make my own.
There three guidelines for buying a good one is to avoid the ones that have high fructose corn syrup listed as the first ingredient because they are too sweet. I found that ruled out most of the specialty sauces in my market! Second, avoid sauces that include thickening agents and stabilizers, because they give an unpleasant texture. Last, don't depend on price as an indicator of quality.
They also liked Stubb's and Lea and Perrins but Hunt's Original, Open Pit original and Jack Daniel's Grilling sauce were not recommended. I'm just reporting, I'm no expert.