I have several Vortex optics including rifle scopes, a spotting scope, binocs and a rangefinder. I prefer Crossfires over Diamondbacks, even though Diamondbacks are a higher grade glass than Crossfires. My one Diamondback scope lives on a .22LR after starting out on a 30-06. My Diamondback spotting scope is fine for the range and I’ve used it out west but if I needed to use it consistently I’d switch up to Viper, if not Razor.
Crossfire scopes are great value. If you need something better than Crossfire skip Diamondback and go to Viper. I have a 4-16x44 Viper HS and I like it. I LOVE my Viper HD 10x42 binocs. A phenomenal value rifle scope is the Viper HS 2.5-10.
Point is, you are right to question the value between Crossfire and Diamondback. You’ll get better eye relief with Crossfire which equals more comfort. If you want better glass quality than Crossfire skip up to Viper. Razor glass is awesome but Viper is phenomenal value - you’ll usually see significant declining margins of return going from Viper to Razor.
I do have a few Razor HD LH scopes that are AWESOME value, but it’s the unique G4 BDC reticle exclusive to the scopes that draws me to them - I’d be perfectly happy if it was Viper glass, but would not invest in Diamondback glass over Crossfire.