Welcome to the 'fire; you've chosen an excellent rifle chambered to a fantastic cartridge!
Of those three on that rifle I'd go VX2 for same reasons others have mentioned, chiefly size/weight.
An FXII 6x36 w/ dots would be my first choice though. I'm kinda hooked on those, and a 42mm isn't bad, just smaller is more in keeping w/ the light overall weight of the rifle.
Efw,
I've not owned a 6X36 though I've often wondered if I was spending more for the 6X42 and getting less for exactly the reasons you've mentioned in keeping w/ the lite overall weight of the rifle.
Shod
