The problem with a "match grade" barrel is that either there exists no known or agreed-upon standard for such a moniker, or it has long been forgotten or outright ignored. These days, "match grade" barrel on a handgun means as much as "new & improved" on the bottle of dish soap you just bought.
I bought a KKM barrel for my Glock 29 because I wanted to properly shoot .40 S&W from this pistol and the KKM does that
irrationally well and the pistol shoots so darn good that it almost annoys me. (almost) And a lot of folks choose to replace Glock barrels because of a lack of case head support or their perception of same, or to get traditional land & groove rifling rather than polygonal rifling in the OEM barrel.
Is there a "best" aftermarket barrel for a Glock? Hmm, would be tough to answer well -- especially for most folks who tried ONE and stuck with it. I haven't met anyone yet that hated their Lone Wolf barrel, but I went with KKM and if someone else makes a better G29 to .40 S&W conversion barrel than the one I have, it would have to fart unicorns to impress me more than my KKM barrel.
No, I take that back. The unicorns would not impress me more than what I've gotten from my KKM barrel. And a bonus is that my KKM barrel didn't come with a completely RIDICULOUS cartoon wolf on it. And Lone Wolf can sell you a barrel without that awful looking thing on it... but you have to pay them more for that.
That annoys me enough to add it to this post. I'm sure some folks like the cartoon wolf, much like they have skulls and "Punisher" emblems on their guns, too.
Variety being the spice & all that good jazz.