Which will it be.
The difference between 'em is the response and the shape. Personally, I like O-ring responses (Lyn Fury) better than hybrid (KickSide), but I like the Kickside’s shape better. If you’re like me, though, by the time you get good enough to figure out your preference, your yo-yo will be so banged up that you’ll want a new one anyway. Just get whichever one looks cooler. If you’re new to yo-yoing, that’s gonna matter way more than response system preference.