Well, I like the Urban Grudge more than the HG-55 (though I've never had an Urban Grudge).
I did have an HG-55 Military Overrun though, and while nice it was a bit handle heavy if I remember correctly. This is ultimately why I am not a fan of the Corrugated Bevel Technology, as I feel that excessive weight should be removed from the handle rather than the blade.
I am not a fan at all of anything with a hollow grind like that which is featured on the HG-55(even if they are shallow-which in this case it is
not), I much prefer the full flat grind on the Urban Grudge in this regard.
I also feel that the UG handle is a definite improvement over that of the HG-55. The jimping on the HG-55 is also unnecessary on a knife that is .25" thick, it's only really necessary on thinner stocked knives, IMO.
So, in my eyes the Urban Grudge is the most favorable choice of the two. The only problem is that they are damned hard to find on the secondary market, and usually will command a premium because of this.
You could also go the route of having an HG-55 modified to make it similar to the Urban Grudge. Here's one done by Avalanez here at BF if you haven't seen it yet.......
http://www.bladeforums.com/forums/s...nly-Jerry-will-hire-me-Military-Grudge-what!-!