For large scale conflict, I think I'll go with the Titans. Scores of Defenders providing protection and generating orbs like crazy, and scores of Sunbreakers raining hell-hot hammers from on high. Seems pretty unbeatable. Plus, in a realistic fight (not balanced by Crucible nerfing) Titans have the toughest armor.
If Hunter invisibility worked against other Guardians, they might have a decent chance though. You can't kill what you can't see.
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If this was completely lore based, hunters would win through living in the wilderness and using guerilla tactics. You can't kill what you can't see. Especially if it just shot you in the head from a half mile away.
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You certainly can if you splash hammers at your feet