Definitely what AlexSimon and stilltortoise says.
Akrigg rides the same places normal people ride – regular trails with the occasional rocky drop, dead tree, etc – so its in a way ‘real’, and although he’s on another planet skill wise, the average rider like me can at least relate to it, and maybe try that little bit harder next time (maybe even inspire?) to finish a certain section that’s particularly difficult.
MacAskill, although technically brilliant, does more crazy / unrealistic stuff like backflips off phone boxes, which I just can’t connect with.