Puncture Protection: Gator Hardshell > Gatorskins > GP 4 Seasons
Grip: GP 4 Seasons > (Gator Hardhsell = Gatorskins)
Rolling Resistance: ??? Not sure
Overall Durability: Gator Hardshell > Gatorskins > GP 4 Seaons

I'm not sure I could tell that much difference with grip between the GP 4s & Gator Hardshells, but I do thin it was slightly better.

I find the Gator Hardshells are much longer lasting tires that the other two, and was pretty disappointed when the GP 4 Seasons started showing casing threads what seemed prematurely.

I can't tell much difference in ride quality and rolling resistance between them (Usually 25mm tires for me).