You'd probably be hard pressed to choose one over the other. I shoot HellRazors while a good friend of mine recently started using Montecs. They are both very similar in design. I personally slightly favor the HellRazor for some reason I can't put my finger on.
Same BH for the most part. G5 makes many excellent products and their BH are no exception. I shoot the montecs with great success and they seem to hold their edge very well and are spot on accurate with field points. I shot a doe let a buddy borrow it and he shot a doe with it then his brother killed a coyote with it. All the same head without sharpening it. They are awesome broadheads.
I shot the Montecs for years but I will say the Hellrazor is sharper out of the pack just harder to resharpen . I got away from the Montecs because they seemed to make a pretty loud whistling noise in flight . Killed several deer with them and if you can resharpen them you can kill several deer with the same head .
I was told the angle is hard to sharpen on the montecs. I laid mine flat on a diamond stone and the archery shop told me this was wrong for this particular BH . He said it is fine for Hellrazors . I have rolled the tips while hitting bone with the hellrazors but not often . I am thinking about going back to one of them this year . I shoot about 6-10 deer a year in Fl and the broadheads that can be resharpened are a big plus to me .
I used to shot Montecs, but this year I just couldn't get them to fly like my field tips and I usually could. I tried the hellrazors and they fly identical to my field tips and i think they may be a little sharper than the montecs. I'll be using the hellrazors this year
Hellrazors are scary sharp. I've used several broadheads & these were the first that i ever handle where i truly respected the sharpness. I shot a deer with one and the broadhead went thru the buck and he had no idea he was shot. He walked maybe 10 yards and then bedded down for his final resting place.