My buddy has that same scope, he’s had it for like 15 years and it’s a badass scope. I’ve never compared it to swaro or Kowa but it’s a solid scope that I’d assume compares well
The Athlon Ares is as good or better than the gen 1 razor and is better than a viper in my opinion. 15-45 is compact and has a big FOV, I just bought one from Doug and it’s legit