I have come to a conclusion, Bladedancer has the highest high (my highest kill count was with a bladedancer) but on an average I do worse with it than Gunslinger when it comes to KDR and kill count. Also throwing knife and exploding golden gun are quite good.
Blink is great but the twitchy jump gunslingers have has it's own use. And Quickdraw is an amazing perk, probably the best exclusive perk, and you miss it an awful lot when you play without it but it's only essential if you keep to the same play style that you do when you play Bladedancer. When you play gunslinger you should play a passive aggressive playstyle, which is also the optimal playstyle for TLW. Coupled up with things like throwing knives, tripmine and a jump that complements the hip fire bonus of TLW and what you have is a class that fits TLW like a glove. I really do believe gunslinger is the class if you want to make best use of TLW and it was the intention of the developers, even the golden gun model is that of TLW's on fire
Basically you just need to adapt to it and build your gameplay around what's available to you and you'll see that there are perks and disadvantages to both.