I've been to all of those but whatever place is in the Mall food court, and there are at least half a dozen places within 30 minutes of my home better than every one of them. There are a few bad/overrated ones here that people call good (like the Pharmacy). But there are a ton of burgers here better than anything I've had in Utah (to be fair the food scene here in general is a lot better as well, but that comes with the territory).
Burger & Company
Candied Rib
Redheaded Stranger
Emmy Squared (only the Big Matt)
Semper Slider
Cletus Burger
Brave Idiot
Cedar City Brewing Company
Gabby's (also trendy) is even better
Ground