As the type B (2) is for more flowing tracks I'd say it would carry more corner speed but with less turn-in, all dpends on your car setups as well.
You can get them from speedtech r/c
or precision rc
although last time I checked they were out of stock. Also rainbowten
if you want to order from Japan, they have loads of other cool stuff as well.
Yeah I would change the std wing, all 3 of those online shops carry stock of the good wings, rainbowten pretty much has every wing, xenons, flaps, yokomo etc.