I have ridden both, prefer the WR. The KTM does have better suspension, but the motor is gutless compared to the WR, which acts like it has 50cc more displacement in comparison.
WR suspension is soft and mushy, but it easier to fix that than it is to fix the KTMs motor.
I heard the KTM does respond really well to a big bore though, and that the stock carb is a bit oversized. It all comes together a lot better with the bore kit. Sounds like your potential bike is all set up with that.
The little WR motor is absolutely indestructible, another plus. Get the KTM though. Your potential bike sounds good, and the orange mafia won't let you ride with them if you show up on blue. Don't ask how I know