I don't have a FX6 scope, but it'd be fair to assume the glass on the VX5 will have far better resolution.
The VX5 being a much much newer design and better coatings.
The VX5hd and similar scopes are night and day better than the older VX3 models.
I had a 4.5-14x40 Mark 4 and my VX5hd is better in every way.
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