Big difference in my mind. Viper is a great scope, but when you get into digiscoping (photos and video through the scope) and glassing in low-light conditions, the Razor would excel quite a bit.
If you have the cash, go Razor all the way. I have one and it is fantastic. You will never be disappointed buying the best quality product that you can afford.
I had the spotter being delivered to my office, I figured someone would always be here. Well FedEx tried to deliver on Saturday and no one was here, they rescheduled for a Tuesday delivery, I am like a little kid on chrismtas eve!!