Ultimately we are talking a very small amount of damage difference and kill speed! IMO the rifle goes faster with the damage implant but I would agree the dps in the black widow is not something to snub ur nose at!

I am trying to lvl my engi so I can try a rifle and damage implant in it! I heal alot so agro shouldn't hurt me to much lol!

But getting back to the comm with rifle or pistol/shield. I think, as far as comm goes, if u know how to group the mobs together and keep them down, the weapon choice is really personal preference!