Should a get a footbag filled with pellets or sand?
I enjoy both footbags for different reasons. Sand footbags are heavier and easier to stall on your foot, so they are a good choice for freestyle tricks. Pellet footbags are lighter and keep a consistent shape while you kick them, so they are extremely fun in circles where you just want to keep it alive, make some long passes, and mix it up. I really do enjoy both for different reasons so get both and have fun!