I have two of the Stom Lake barrels for my G-29 one 10mm and one 40S&W they are great, offer tight chambers with good cartridge case support and accurate.
I also have a 9x25 Dillon conversion for the same and it has very tight chamber specs.
To date my son has four Glocks. He wanted me to start reloading for him. The deal was he relaced his OEM barrels and I'd reload for him. Soooo... he's replaced them with Lone Wolf and loves them. Have not shot the Storm Lake so can't compare those two. The OEM barrel is probably the biggest thing that keeps me from buying a Glock.
you will be more than happy with a LWD barrel. I know storm lake is supposed to be a bit more accurate, but for most shooters, i doubt they would even see a difference between factory and a storm lake.