When you weigh the two out you realize that their the same... For the jungle, you get mossy cobblestone for days, tripwires, redstone, dispensers, arrows, pistons, sticky pistons, chiseled stone (the only appearance in the game), and the 3 chests. For the desert, you get chiseled sandstone, orange wool, 9 TNT, and 4 chests. The chest will randomly generate the same kinds of items for all of the temple chests. Also remember that desert temples tend to spawn near desert villages. Jungle temple are harder to find though but I find the desert temple rather easily... so I would say probably jungle
