I cannot understand why anyone would say that “only chalking once per game” is somehow a selling point.  Chalking is part of my PSR.  If it isn’t every shot, it no longer is part of the PSR and becomes a disruption.
I like Taom (V10, 2.0, and Pyro) because it’s less messy.  I have five total.  I’ll probably settle on two Pyros for my home table.  Right now, I have a light blue 2.0 and a Pyro that I use interchangeably.  The light blue 2.0 would be best suited for these new Grey Simonis tables, IMO, since it looks pretty much grey. 
I will always do my best to chalk every shot.