I own 4 bikes, only one had internal routing. I am not saying its better or worse but its a PIA to deal with IMO. Nothing easier than external. I will not purchase internal if I can help it but wouldn't stop me either. I just try to avoid it.

I did watch the video for the fun of it but before I even watched it I noticed this guy has what appears to be a carbon Canyon clamped NOT at the seat post? Umm that is kind of a no no. I bet youtube comments beat him up badly for this!