For me its The Cure rocket launcher from FWC, which I got way back in Week 2. Second to that would be Praedyth's Revenge (until I get Fatebringer). The Cure was a FWC Faction gift and the roll I got includes Field Scout (holds 2 rockets instead of 1) and Grenades and Horseshoes (proximity detonation). It has always been my go-to legendary PvP heavy. When I fire, the target dies. I do better with it than any of the raid heavies. However, just got a brand new Radegast's Fury and I think this is finally going to displace The Cure. I rolled and rolled until I got what I wanted. It has Proximity detonation and two reload speed perks (Flared Magwell and Who's Next). Or I could use one speed reload perk with field scout. The velocity is slightly slower than The Cure but the Blast Radius will max once I level this thing up.