The straight one is high downforce, the curved one gives less downforce. From what I've tried and what others have told me I think a downforce chart would go like this:
Xenon type A/B straight High downforce/less corner rotation
Yokomo GW3.1 straight
Xenon Type A/B curved
Yokmo GW3.1 curved
Flap Type-R/Xenon type C/D (curved lump)
Xenon type C/D (square lump) Less downforce/more corner rotation
This is what I've found through my testing, most of this was done on a very small carpet track. This may not be correct and feel free to add your input. Also if there are any other wings, write what you've found with them.
PS stew will do a lot of correcting to this!