Go with the PC10 and try to get a dedicated single monitor cab. You get more games in 1 cab. Later you can just buy a Vs. pcb, with whatever games you like and a Vs. control panel, and also use it in the PC10 cab since they use the same wiring harness. I do this when I want to play vs. Excitebike.
Other than being able to select difficulty and coin-up individual games on the Vs. games, it seems the Vs. versions of Gradius, Castlevania, and Goonies don't offer too much difference or any extra levels compared to the Playchoice versions. At least Vs. Excitebike has the bonus levels that are not in the Playchoice version. And Vs. Balloon Fight lets 2 players have their own screens that scroll vertically, on a Red Tent or dual system, which you can't do on Playchoice.
I know there are lots of Vs. titles not available on the Playchoice. You just have to decide if they are something you're really going to spend time playing.
The 2 main Vs. games for me are Excitebike and Balloon Fight.