Hi Alex, the 99 is very much suited to wave riding, whereas the FW STB is a combination of flat water, waves and a bit of freestyle. So the FW has a flatter rocker and fuller rails. For your conditions of 50/50, I would suggest sticking with your FW STB 95 to be honest. The Stubby 99 is great for float and ride waveriding, but it's less oriented towards flat water for sure.