WB for sure. Just make sure not to launch WB at full power or else it will move around alot making it easier for an attack type to hit it. I usually launch 60%-70% when I use WB.
EDIT: WB is better than WD because WB creates more friction with the floor of the stadium and is therefore more "grippy" which makes it less likely to get knocked out. WD has a tip which prevents you from making friction with the floor of the stadium.
EDIT: WB is better than WD because WB creates more friction with the floor of the stadium and is therefore more "grippy" which makes it less likely to get knocked out. WD has a tip which prevents you from making friction with the floor of the stadium.