VXII
[ul][*]Multicoat 4® lens system for unparalleled light transmission in all light conditions (formerly available only on Vari-X III riflescopes).[*]Seven reticle styles available[*]1" maintube[/ul]
VXIII
[ul][*]Indexed Matched Lens Systems[*]finger adjustable 1/4 MOA windage and elevation dials with resettable pointer dials[*]Reticles - Thirteen styles available[*]side focus parallax adjustment.(on some models)[*]Maintube Diameter - One-inch and 30mm, manufactured from 6061-T6 aircraft aluminum alloy.[*]Estimate Range - Range estimating feature on the power selector ring.[/ul]
In summary, a better lens coating, better turrets and more available features and reticles.