Both will do the job well.
And while Krytac's externals may be a tad behind, I can account for their internals. A pretty gun's useless when all it can do is hang on your wall.
I think Krytac removed this feature due to their quick change spring system, or something along those lines. I may be incorrect.
Another thing to do is look at each companies exclusives. It may not seem like a big deal, but in the end, you will choose the gun you like most. (Internally and externally.
Appearance, unlike performance, is not very changeable. For the most part, the gun is stuck the way it is when you buy it.
Sure, change out the stock, grip, add a nice scope or red dot, or even cover it in rail covers. It will still be an LVOA or an HK417.
Krytac has the LVOA and Vector, and is soon to have the GPR-CC and Origin 12 shotgun.
VFC has the HK rifles and the Avalon. (Actually, some more. But these are the ones I assume you would consider.)
Krytac has the Trident.
You need to choose for yourself. Think, "Which gun do I like most? Will I be willing to sacrifice a few details for performance? Will I upgrade?"
Lastly, Krytac has amazing customer service. It is yet another bonus you get when buying their guns.
Best of luck.