Tlalac is by far the best IMO. Although it requires a different play style because it is pretty average without the overflow perk. When I use a non warlock specific scout I prefer the Jade rabbit in pvp and pve. It feels like a pocket sniper. Also, the fate of all fools perk is pretty amazing. When I use a legondary scout, I use "last extremity." It has similar stats as the jade rabbit just without the FOAF perk. The high ROF low impact weapons just feel weak to me against tier 2 and above enemies. But, I feel it is more up to personal preference.