Assuming PGA Superstore fits indoors, they will do a great job of fitting, depending on the quality of their staff at that particular site.
Throwing in some sarcasm, they will best prepare me to play at Top Golf. I am a much different golfer on turf versus indoor mats. My personal opinion is to find an outdoor fitting preferably at a course sponsoring a Titleist fitter.

Once on a golf trip to Scottsdale and once in the Palm Springs area. Neither one was a planned fitting - just killing time checking out the latest products. Did a fitting at both and it did not go well. Reaffirmed my belief that if you're going to do a fitting, find an outdoor Titleist fitting event, even if it means a bit of travel. In both cases the fitter did not know what shaft options were available, and the simulator was not putting out accurate information. At one the guy told me I was hitting a 7 iron consistently 195 yards, and while it did pump up my ego, I'm pretty sure that isn't going to happen unless I'm playing on a frozen lake. Might be just the guys I was working with, but why take the chance.
Indoor fittings are great for indoor golf. Once you've been to a true Titleist fitting outdoors, you'll find there is no comparison.