I currently don't have a Dry Heat so others may give you a better comparison, but I'll try to give you a relational comparison (A > B, B > C so A > C).
The problem I had with the Dry Heat was that it didn't push that well when the heads started going and also it was still too strong downlane. It mostly hooked almost as much as my Crunchtime and Hex. Most of the lesser hook came from the lower flare. The cover was a solid (same as Crunch, Havoc, etc) and it had a medium RG.
The Desert Heat is a lot different. Pearlized cover, higher RG and a lower diff. It pushes extremely well and is very smooth off the dry. As you can see from my videos, it's MUCH weaker than a Heat and it has a much stronger drill. I haven't had a chance to really try it on "dry", but it allows me to square up more than any other ball I've ever had with Track. I'm heading to Puerto Rico for a tournament next week and we bowl at 9PM so I might get a good idea how good it is
Hope that helps.
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Anthony Chapman
Track International Staff
Turbo Grips 2-N-1 Staff