Most on these forums seem to favor the Maxxis 8008 over the Carlisle HD. Main reason is history. The Maxxis have a long history of being one of the few decent ST tires.
With over 30 members reporting issues with their Maxxis ST8008 tires there not without issues either. Not all Maxxis ST 8008 tire sizes has the nylon cap under the tread which may have contributed to those that had issues.
Carlisle HD has been on the market for about a year now. It takes several years and 30k-40k of service to find out just how good they are or aren't.