The Mark 10 was more reliable. It was also a WW1-era weapon and was assigned (as far as I know) only to the S-class.
As for Torpex:
Quote:
Torpex is a mixture of 37-41% TNT, 41-45% RDX (cyclonite, cyclomethylene trinitramine) and 18% aluminum. HBX and H-6 are also TNT based with additives to increase their explosive power or increase their stability.
Torpex is attractive because of the increased explosive energy and higher detonation velocity of RDX as compared to TNT and the prolongation of the pressure wave by the aluminum. On a weight basis, Torpex is conservatively estimated to be about 50% more effective than TNT as an underwater explosive against ships. However, Torpex is more sensitive than TNT and RDX is expensive and difficult to make safely.
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http://www.navweaps.com/Weapons/WTUS_Notes.htm