It really comes down to which you like.
I have ran a TM38, a pwk39, and a vm44 on a zilla. I ran a pwk38 a/s. I will say the a/s is different than the typical pwk.
They are all easy to tune if you have a clue. Many usually just pick a style and stick with it.

Most people tuning will only change out main jet, pilot jet, clip position and adjust air screw. Couple more might change needle, and few more will change something else.

The lectron is great is you know how to use it, if you don't they are a huge ****.

I am still waiting for someone to try the APT smart carb on a zilla, but I think I heard some bad news about the company (like they were shutting down)