I used Gatorskins and 4 Seasons both for years. Couldn't tell a lot of difference. Switched to 4000sII and liked them much better. Found the GP GT in 25, seems to ride as nicely as the 4000 but perhaps more durable as in fewer cuts. I like the Panaracer GravelKing for 28 and larger. Would like to try the new Michelins.