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So the GW's Great Unclean One to me looks alot like the Orc River Trolls over by fantasy. And they size up the same as well.
Great Unclean One -
size = http://images.dakkadakka.com/gallery/2009/8/19/48644-Chaos%20Space%20Marines,%20Great%20Unclean%20One,%20Nurgle,%20Rhino.jpg
looks = http://www.games-workshop.com/MEDIA_CustomProductCatalog/m2470957a_99819915014_GreatUncleanOneCFC01_873x627.jpg
River Troll
size = http://i112.photobucket.com/albums/n187/Timbor/Warhammer/Orc%20Army/DSC02446.jpg
looks = http://www.games-workshop.com/MEDIA_CustomProductCatalog/m1080085a_99120209022_RiverTrolls1_873x627.jpg

Also the GW one is about 96 while 3 river trolls is only 74. The forgeworld one looks hand down better than both of them but your better off selling ur kidney for something else.
Personally I think the trolls are way better cuz cheaper and with some conversions might even look better, but anyway, ur thoughts?

Actually I'd say the Rivertrolls look much better and more befitting as a GUO. The GUO model looks like a huge case of trying too hard. The River trolls already look the part to me though appear to be on the short side. A simple bit of work could make the heights match if there was any difference.