I own both, as well as just about every other case made for our phone...
I hate the i-Blason, and have since I took it out of the package. Nothing really wrong with it, just not my taste. Inner portion is too mushy, hard to slip it in and out of my pocket, and I don't think anyone would call it "thin".
For "thin and rugged" you are far better off with the SUPCASE. Also look at the TUDIA Ultra Slim Melody.