I think you'll be happier w/ the Curtis solution, but the NH solution is definitely physically stronger and you don't risk any damage to your FEL since it has to be detached to use the NH plow.
You may end up bending your FEL lift links (the gold kidney shaped links that attach your FEL bucket lift cylinders to the bucket) with it though if you are plowing heavy snow with a quick-attach blade. I've bent mine, using my bucket on the FEL for a bulldozer, and lifting large boulders. It really takes a *lot* of effort to do this, so it's unlikely it will happen. Lift links can be straightened but they're only about $120 to replace all four, and I don't trust 'straightened' metal as it's strength is severely diminished unless it's heat-treated somehow.
If you're only clearing snow off a paved or gravel road, the quick-attach should work fine. If you're planning on running into several immovable objects, you might condsider the NH blade.
Personally, I have an 8' Boss V-plow for my Chevy 2500 Diesel 4x4. I've been thinking of welding up a quick-attach mount to attach the plow to my tractor's FEL, since I tend to have a LOT of snow here at times and it might be fun to try out the plow on the tractor, since the tractor has a lot better manueverability in deep snow than the truck ever could.
Probably not a great idea though. Currently I use the tractor to clear a path for the truck to get out, then finish off plowing with the truck (it's really fast once you get moving), then go back to the tractor to deal with the really deep stuff or move piles around.