Here are a few comparison pics:
In general, I prefer static sculpted pieces to action figures. But when all is said and done, I prefer the Sideshow Jabba because of the size of it all. However, there are some great things about the GG set. Most interestingly, they have incorporated magnets into the throne, so the little extra pieces like the pillows, plate and cup can be attached and held securely in place. Even the tiny Salacious Crumb features a magnet, and can either perch on the Max Rebo piece or be positioned on one of the throne pillows without fear of falling off. Bib Fortuna also features a miniature stand in the style of the other GG statue bases, but the figure itself is removable and has a felt bottom and more magnets, so he can stand on his own or be attached to the magnetic Jabba throne. You also have Ooola and the light up Jawa--and of course, the Bib statue was free when you purchased Jabba and the band. That decision scores some points for GG.
All in all, there are some very nice touches here and I think it's one of the better items that GG has come up with. But in the end, I give the gold medal to Sideshow. The larger size allows for that much more detail, and the fact that it is in scale with the accompanying 12" figures means that you can have a great display. The GG busts will look odd sitting in the mix without legs, and the full statues are not in the same scale. So for an overall impressive and matching display, you should go with Sideshow. If you are a freak like me, you can have both and I think you will find something to like about either one. Each stands as a great example of some of the best work of their respective companies.
(Of course, with GG you don't get Bubo. Keep that in mind.)
![Big grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)