I believe the Incredible is the wet install for the back while the other is the full dry install all around.
The set (
http://www sgpstore.com/product_info.php/cPath/21_28_89/products_id/1453) actually comes with a Crystal clear front film which is dry for the front and then the wet for the back.
The other one (the EX ultra crystal) is a dry install all around.
You can tell the difference because the Incredible comes with the solution spary.
Personally I got the Ultra Matte (
http://www sgpstore.com/product_info.php/cPath/21_28_89/products_id/1454). I dumped the clear screen shield and actually got a Power Support Anti Glare since for some reason that kit didn't come with an anti-fingerprint front piece which is downright odd.
The Ultra Matte back show zero in the way of fingerprints and is a lot easier to install (it does use the spary). Since it isn't clear, if there is a speck of dust it actually doesn't show up so you don't have to be absolutely perfect to get a great looking back panel. Not to mention it sticks to nothing. Not even lint. The clear "wet" protection pieces usually attract way more lint in my experience, even when you get a perfect install.
As for the front, I went with Power Support because a) their anti-fingerprint looks better to me and b) it has 2 seperate cutouts for the camera and earpiece making it easier to install.
All the SGP ones I've install (and other brands that use the one cut out as well) have all had a very slight lift around the earpiece. I am very picky and that truly bothered me.
Power Support also has held up a little better for me, but I'm rough on my device. The Power Support has been through some tough scrapes and a couple of falls, yet has no marks on it at all.