Sorry for my abscence, I completely overlooked this thread when checking the forums yesterday.
Either way, as the previous judges stated, both stunts are rather incomplete. One of them doesn't grind to the end, and the other doesn't "ride" the tunnel to the end. The thing is that Alteryo's has little to none airtime, and Vhost has a huge bost at first. Considering the objective and the execution of both, I'm voting for Alteryo