Playing any kind of streaming map will help your streaming. You wouldn't just practice passing if you played basketball, you'd practice shooting, dunking, dribbling, and whatever else too. You want to use the same methodology in this game; practice everything. Above all, though, make sure it's fun. If you're having a good time, then you'll play more, and that'll give you more overall experience.
I'd also consider that different play styles favor different speeds naturally, so your play style is going to dictate what speed you naturally feel more comfortable streaming at.
I'd also consider that different play styles favor different speeds naturally, so your play style is going to dictate what speed you naturally feel more comfortable streaming at.