For an aiming device, the difference is negligible.
The VX-6 has very nice glass.
I had a VX-6 4-24X52. The glass is every bit as clear as my Swarovski z5 5-25X52 and definitely better in the color rendition department.
I sold it only because the rifle it was on was a disappointment so I disassembled it and sold all the parts.