N/A Hammerli AP-20 vs AP-20 Pro

Currently mulling over the differences between a normal Hammerli AP-20 and the AP-20 pro. Mainly I'm concerned about the polymer grip and the air tank.

The grip seems to be sort of ambidextrous with additional plastic parts for a bottom shelf and where you're palm/wrist would be (sorry for the poor terminology, new to this), as opposed to a larger wooden one that one would sand down. Not sure about other forms of adjustment. Would this be a significant downside for some of you? I was considering at some point just wrapping it with putty, 3d scanning it, and printing out a custom grip anyway, unless if traditional wood and sanding is the better way to go.

The air tank doesn't seem to have its own visible gauge. Is this also something that some of you would consider to be too big of a downside? I think I'd be okay with counting, but is there some other advantage I should know about of having a gauge on the tank? Also when looking through some older posts online (not necessarily on this site), I've seen one or two people mention that the vertical tank is weird. I'm not concerned about that as I'm 99% sure that it can be oriented horizontally, and the pictures just have it shown vertically to demonstrate the functionality.

As for the AP-20 Pro, the tank has a bit more capacity and a gauge, and the grip is wood.