If you've done your homework and know which kind and brand of tint you'd like for your car, that can determine where you go for tinting. Most tint shops carry only one, maybe two, brands. Tint King carries four or five. I got exactly the tint types and brands I wanted on my car and TK did an excellent job. If you don't particularly know or care about what the different types or brands are, then just go to the cheapest place that does a decent job. TK is the best known and best respected tint shop in the region, and they've been around a long time. Randy, one of the tint techs who work there, won first prize in an international tint competition in 2013. He did my F30 in June and I have no complaints.
No, I have no financial interest in TK.