what is your favorite halo weapon

For human weapons I would have to say either the Battle Rifle or the Sniper Rifle, but for the Covenant I would have to say 1) Energy Sword 2) Plasma Grenades 3) Energy Rifle... But that is just my opinion, and I've only played Halo 1 and 2, I've played the first 2 levels if Halo 3 but I haven't really seen enough of the weapons in it to make a decision about any newer weapons....