If Destiny was still how it was in year one I'd pick it but I've had warframe for about 2 months now and I gotta say my Excalibur, Mirage, and Nyx would completely kill any and all guardians in about 5 seconds... Just imagine a group of 3 people, Frost prime, Trinity prime, and Nova prime against an entire army of guardians... I think the Tenno would sure win! If you haven't played warframe or played it long enough to be good at it then your opinion doesn't really count...
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Ash's blade storm in crucible would decimate. Tenno>Guardians