I have a March F, and my partner used to run a Razor...so I'm quite familiar with both.
While I don't have a "negative" opinion of the Razor, I certainly don't have a particularly positive one either. While it's a decent scope, I just don't like the size of it, considering it is only 5-20. It's size would be better warranted if it were 5-25. Because the top end is only 20x, it would be better if it were 3-20. I also hated the massively tall elevation turret. Glass was so-so as far as I'm concerned. Bottom line (in my opinion) is I like other scopes better than the Razor at this pricepoint. There are other scopes for a bit less I think are better value, and other scopes that are well worth the few hundred more dollars. None of this is to say the Razor can't be, or isn't a very capable optic for our purposes.
I can't say the same about the March, it's a fabulous little scope. I really only have 2 gripes with it. One is the parallax knob is too sensitive; because most of it's rotation is used to take you from 5 yards to 50 yards, leaving little rotation for 50-1000 yards...meaning it is touchy. The other gripe applies to mounting it on an AI, M2008, M2013 or any other rifle with an overly long pic rail. The scope is so short you've got to use very tall rings to get power ring up off the rail, and also to get the objective bell up off the rail. This really doesn't apply to most Savages or Remingtons.
I haven't thrashed my March, but I doubt it is less "rugged" than the Razor. Hard to say for sure though.
As far as the eyebox goes, it is true the March is very sensitive when you've got the power cranked up. However, it is no problem whatsoever with the magnification settings commonly used for positional shooting. Who runs 20+ power when shooting positional?
In terms of glass, there is absolutely no comparison between the Razor and March. The March is way, way better. The resolution is incredible. I usually have no issue seeing 7mm bullet holes in the black at 300 yards with mine...and that is something my 5-25 Premier has a hard time doing. The Razor is like a March with cataracts.
Edit to add: It is worth mentioning the warranty difference between the Razor and the March. Vortex obviously has a no questions asked "VIP" warranty. March is 5 years.
The retailers of March can stroke our cocks and tell us the 5 year warranty thing is only because of Japanese laws, and they "promise" (verbally) they'll warranty it longer...but bottom line is the March *does not* carry the same warranty as Vortex.
Also, if you do have an issue, the North American distributor of March is not capable of "working" on them much. So, you'll be looking at a $75 bill (or more) to ship it internationally to Japan.
Just some things to consider.