Originally Posted by
Sixty Fiver
If the proper bb tool does not work you can use a gear puller... riding it off is not a suggested practice as it can damage an otherwise decent crank arm.
If the threads are stripped, I would think it is no longer "an otherwise decent crankarm".
I'd "ride it off" as that is least likely to damage the bottom bracket or frame. All of the pry and beat techniques have a strong likelihood of doing collateral damage.