I have the Ruby Expert and I LOVE my bike. That said, it fits me very well (when I had it professionally fit, I only changed some very very minor things). While I am biased to the Ruby, I would go with the bike that fits you best. If you can tell that easily, then go with the Cannondale. However, I would think about whether you are testing the fit based on a mtb style of riding, as opposed to road ... Can you test these bikes on a longer ride? That is what I would try to do first ... But, either way it sounds like you will be happy.