Genuine Fractals is considered the industry standard
I can't speek for Blowup, but I ahve been using GF since 4.0. I am now using 6.0 and love it.
I have been using Genuine Fractals since 4.0 and using 6.0 now, which is considered the industry standard in the graphic design world. I will be getting the FREE upgrade to the new next generation of Genuine Fractals now called Perfect Resize 7, when it's available in
December 2010, It is suppose to be a major upgrade with new features.
I have been using Photoshop since beta testing it back the late 80's for Adobe, and although you can do a lot of photo manipulations directly in photoshop, I use OnOne software's Plug-In Suite 5.5 witch includes Genuine Fractals as well as the 5 other great plugs-ins, to do a lot of photoshop manipulations with OnOne's plug-ins very easily. I highly recommend Genuine Fractals and all the different plug-ins OnOne Software offers.
Check out their website, they have FREE downloads and great FREE tutorial videos, check out the Genuine Fractals videos, to help you make your decision.
http://www.ononesoftware.com/