Hottest I've been in is what ever the record temp for Middle Ga has been in the last 40 years. According to google that is 108, but I seem to recall higher temps than that occuring.
Temperature isn't as as hot, but what those records fail to associate with those temperatures is the humidity. While Havasu might have hit 130°, the humidity there was probably in the single digits, maybe 20% at the max. At that 108° here, the humidity was probably somewhere between 85% and 95%.
I've been watching a lot of mid west and western YouTubers over the last few years, especially the offroad recovery stuff around Arizona, Utah, and Nevada. Those guys that have spent time in the South East during summer will tell you in a second that they'd rather have the dry heat back home. That's not to downplay the dangers of hot and dry, you'll dehydrate in no time over there because you don't realize how much water you are loosing. Feeling wise, it seems like the dry heat is better.