Drop chance is = BUT gold/exp and torment level legs drops are not.
I can only hope this might easy the facepalm surely occurring at this moment...
I think, that if You want "gold/exp and torment level legs" - You should farm rifts. If You want caches - You should farm them on normal, to get as many as possible for the shortest time.
The loot from a Horadric Cache won't change based on the difficulty, but Torment 1 does offer incentives (like an increased drop rate, gold and experience) that help while you're earning a cache. If what you want is to get as many Horadric Caches as possible then a lower difficulty might be optimal, though, since all of the benefits for increasing the difficulty to Torment 1 exist outside of the cache specific loot. http://us.battle.net/d3/en/forum/topic/12504580894#new-post
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If you run after two hares, you'll catch none.
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http://us.battle.net/d3/en/forum/topic/12504580894#new-post