As i wrote on another thread, glass needs to suit your eye like a particular pellet needs to suit your rifle, so just because a scope suits one man does not mean it will suit you!
You need to look through the scope options & see which is best for YOU.
Personally I found the reticle on the Varmint very thick & clumsy, I've never tried a nikon.
As soon as I looked through a Mamba-lite I was reaching for my wallet.