When I murder guardians in the crucible or IB it is always with my legendary Salvation State/Fang/VoC, period. To me its the most versatile, it can compete with snipers on distance engagements and if used properly with the right strategy and shotgun, you can do great. I never used to use shotguns but with the prevalence of Thorn/TLW's I need something to compliment the scout for close range.