I'm out of these at the moment. There's lots of motor information on the web, I've not tested these myself personally but from what I've been told SHS HT are 16TPA whilst the ZCI HT are 22TPA and the ZCI High Speed is 16TPA. You'll find various manufacturers use different names to rate their motors - Ultra Torque, Balanced, High Speed etc.
I've got a SHS motor order on the way, I'll be selling the SHS motors at the same prices as the ZCI's, with P+P they will work out around £2 more than what you can buy them on Ebay from HK.