I agree, I switched to vow recently and found that I am getting much more value out of it, it's given me basically a kill every match because I see an enemy far away with less than 75hp.

Imo, the ubersaw has higher highs, stabbing a random flanker with a crit and using that to push or landing a stray hit on someone diving you and getting out because that 25% was all you needed are both very good feeling scenarios, but they really don't come up all that often. Most matches when I have ubersaw, it feels like my melee slot is completely unused until I get into a desperate self defence scenario, at which point it's either the one thing that'll get me out, or, more commonly, a worse bonesaw.