I'm by no means an expert, but I'd just as soon shoot lead from my factory barrel as my LW one, in 9mm. Accuracy is just as good, and it cleans faster. A swipe or two with a chore boy, and it's gleaming. The 9mm barrel is the strongest one; a little bit of fouling won't get you into trouble if you clean it regularly. I.e., don't shoot 500 consecutive rounds of lead without cleaning, then start shooting +P jacketed rounds without at least looking down the bore. If you're the type that cleans your guns after every range session, you might want to give the factory barrel a try.
I played with my LW 40-9 conversion barrel a few times, when it was my only 9mm. Then I got a G19, so I put it away and forgot about it. Then I started shooting lead, so I pulled it out, again. Then I started shooting lead out of my factory Glock. Now, it's back in storage. Likely for good. But it's a good barrel at a good price. I can't imagine why anyone would pay significantly more for the other brands. LWD is a great place to buy all your other parts and accessories, while you're at it. The selection, speed of delivery, and customer service are excellent.