Hmmm if you have a Tankbuster, I'd say go for a
Skinny ASH instead - I've owned a CG ASH1, Skinny ASH and Tankbuster and always wound up grabbing my Skinny due to weight on the belt...
Big difference between the TB and ASH are also the handle shape - I love the versatility of the TB handle as it feels good in EVERY grip - the ASH, not so much - reverse hammer was weird, choking up was weird and when I chopped the curved end always gave me pinky burn...
However, after a few months I kept my Tankbuster and sold both ASHs due to not being a fan of the ASH handle.
With THAT said, I eventually sold my Tankbuster as well as my SARsquatch has an inch or sore more blade than TB/ASH, skinny blade like skinny ASH that saves on weight, and a fantastic handle that is more comfy to me than the TB/ASH...
NOW WITH ALL THAT SAID, buy an ASH1 to feel it - it's a real evil monster and youll always want to know how it feels

More than half the fun with Busses is trying out all the different models and, if one is not for you, you can usually always break even selling it on the exchange.
So go get your ASH and try her on, but don't sell your TB to fund it
Edit: here is a pic for you - far left is CG ASH, Skinny ASH then the Tankbuster
And a pic of TB, Skinny ASH and then my beloved SARSquatch to show handle differences: