The more aggressive the sidecut, the quicker it's going to dive in and out of turns. However, the board will be a little catchier.
Like most things in snowboarding, a lot of it just boils down to personal preference. Most of the time, you'll catch me on the mountain an NS Evo and Flux Titans. That's a typical park rat setup. But other than a lap here and there you'll rarely find me in the park. It's just a fun setup for me. If I was doing research based on my riding style, I would've never considered either. Go find some demo days and just ride some different shit. Research is good, but ultimately you just have to try stuff. You may think you'll prefer one thing based on your research but then find that you actually prefer something completely different after trying out a bunch of stuff.
"People say that marijuana smoking is going to get in the way of my career. I say to them that on the contrary, my fighting career is getting in the way of my marijuana smoking." -Nick Diaz