That is kind of a tough call, I think. Both are pretty nice scopes. I have more mileage with the Razor, but Cronus seems like a nice design as well.
Choose the one that has a reticle that works best for you.
There are several scopes marketed by different people that are very similar designs made by the same OEM: Cronus, PA Platinum, etc.
If you are particular about reticles, you should be looking at several of these. Basic Razor design is sorta unique to Vortex, but the whole family of 5-30x56 and similar scopes that are on the market now under different brand names are all variations of the same basic design. I think Cronus is in that family, Primary Arm Platinum 6-30x56, Weaver Tactical 6-30x56 (not my favourite reticle), Sig Tango6 Gen 1, etc.
Sightmark Pinnacle is a little different, but is also from the same basic family, I think, and it seems that Frank liked it well enough.
These are all Japanese scopes from a well-respected OEM, of a similar magnification range and supported by reasonably reputable brands.
Start with defining the price range, then look for the reticle that works for you.
To be honest, I test a lot of scopes and as far as selection goes, we live in good times. There are a lot of options and mostly these are all good option, from good brands that stand behind their products.
Every once in a while I do a reality check: yank everything out of my safe and look at what I am actually using aside from testing scopes and there is a pattern of sorts: I tend to prefer scopes of moderate magnification and I am very picky about reticles. I use Tangent Theta TT315M, SWFA SS 5-20x50, 3-9x42 and 10x42HD, a couple of Elcans on my ARs (Spectre OS and Spectre TR), a couple of Shield RDSs, Leica, Kahles and Vortex Razor HD LH on my hunting rifles.
That's the interesting thing: a lot of shooting I do involves testing scopes and I enjoy that a fair bit. However, when I go shooting for my personal enjoyment, I usually grab something from the list above, partly because I am used to them and partly because of the faith I have in them.
I have to admit that of the products in the sub-$1500 range, I still use SWFA SS 5-20x50 a lot, partly because I have a lot of faith in the product and partly because the reticle works well for me. I understand that the market moved on to higher magnification design, but I am not a magnification hog, so this works for me. If SWFA ever updates this scope with a zerostop, I'll buy a couple more. The scope has its flaws, but in this price range I am wiling to overlook a few of them.
ILya