First, thanks for your answers!
I would go for the 9 but it is pretty expensive over here, almost dubble the 10bolt, in "ready to run spec".
What exactly is the weak point in the 10bolt?
My point is, when it is set up with new axles and diff, "Strange" for example, its practically same parts as in the 9? Unless I use big sticky tires on the strip I cant see any reason it will break so much easier?
In the vid where the tire and drive-axle falls of it is because of the c-clip. It's a easy problem to fix, when uppgrading the axle.
Thanks for the 9" length info!