Optic input

[CSTactical]

You won't be disappointed with either choice, it all comes down to personal preference.
Kahles Pros:
Better glass IMO
Lighter in weight
Left Side Windage Option
Vortex Pros:
Cheaper
Wider power range

Kahles tends to be one of our overall favorites here, if you have any questions than please feel free to call us at 916.670.1103

[Echidin]

Of the two, I only have experience with the razor 4.5-27. I loved almost everything about the razor but considering weight and wider range of reticle selection, advantage goes to the Kahles.