Post your pick and reasons.
Edit 2: Looks like almost a majority choose Shadow Price. I'm not surprised. Guess what I'm buying when I'm Vanguard 3....
Edit:
I only have Vanquisher from the postmaster after getting to rank 3 with New Monarchy. I always get killed by Shadow Price users in pvp, which is why I voted for it. I plan to buy it when I'm Vanguard 3
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Overall I'd say Shadow Price. It has served me very well. The Epilogue has its uses and is handy in the Vault, but I prefer a higher impact over rate of fire. I have the SUROS Regime now which really fits my play style, but if I need one of my other exotics in another slot (like Thunderlord for this week's Nightfall) I either go with Shadow Price or The Devil You Know as my primary, depending on the situation.