I would say most the Halo weapons I was allowed to use when I played a lil are more advanced than destiny's (since MC can use enemies dropped weapons, and Guardians refuse to pick other weapons up) Most advanced destiny weapon is the fusion rifle :P... However, I do not remember MC having grenades, energized punches, or any specific abilities of any kind... just a Good old strong soldier in some really good armor... and Guardians are effectively designed to have some superhero like explosive powers... But I do think I heard something about a Spartan laser... which I think was being described like a body shot sniper in Halo... in which case, if this is one on one, MC doesn't have to be as precise to take out the guardian at range.