I tested this out a few days ago, after 30 mins farming at each area, The Temple of Crota dropped me 9 greens and 3 blues.
The cave dropped me 13 greens 5 blues and 1 legendary.
I now farm the cave,
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its random
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#lootcave4life
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RNG is RNG, just because one area in 30 min gave you a legendary over another spot doesn't really mean anything. What does affect drops is how fast you kill hordes of enemies because in the end you get more drops. IMO Temple of Cota nets more items in the long run then the cave.
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I guess people have different experiences.