They are better. Kinda like how HD axle shafts are better.
That said, they really shine when you are doing baja style driving over rough terrain. If you aren't tackling dirt roads at 50 mph or doing sweet jumps or otherwise REALLY beating the crap out of your truck, the benefits are minimal.
Also you need to have them valved to get the most out of them. A local shop who understands can help you out a lot. However the guy driving around in the truck who does this for a living, yeah, he can set them up beautifully. That is when remote reservoir shocks with adjustable valving REALLY comes into play.
Oh and make sure the shocks are outboard. AKA, the bottom mounting is as close to the wheel as possible. If they are inboard they aren't going to do a lot for you.
So yeah, just depends on how much money you want to throw at it. However if you are in low range when off road or taking it easy on dirt roads and mostly driving on the street, just look for some decent shocks and if you want long travel, you can get them in 12". IMO, if you aren't running more than a 35" tire, its a waste of money. (I say this because if you are running 35" or more, that means you are going to be beating the soul of out of the vehicle and that is when high dollar items like this really come into play)
I'd say get a set of OME's and go.