best 20g BB brand ? Biodegradable
First, we wouldn't throw garbage around - typically. BBs are hard to deal with. They are small and u can't really just pickem up. When playing in big fields it could get messy.
Bio BBs are more expensive but no real advantage otherwise. They should have the same performance as plastic ones.
As for our planet - yes it's sad how some people don't care about it. But no surprise to me at all, as I known people that have clearly believe there's no such thing as global warming....... ........ I know eh. -_-;