I am in the same dilemma.
I have always used UltraGatorSkin 25c. I wanted and decided to try the folding Gatorskin 23c to see if I note the weight savings (it's not just my commute bike and roads here are near perfect), but pbk is out of stock.
So it is between the GP4000 or the 4 season. 4 season seems to be a bit more durable? But the ad copy talks about being wet and cold optimized. Riding right now is 90-110F, with the rare, but possible monsoon thunderstorm. That seems to not fit.