I have no idea what the challenge organizers consider are the components of "the best route". I do think that there is a tendancy for challenge routes to be low and unimaginative and relatively easy. I am aware no 200 mile walk is easy. Apart from first timers,I think Challengers could do with nudging towards more challenging routes. This new award may change the atmosphere in the right direction. There is already an unofficial "high" route category defined by 12 or more Munros. The uncompetitive nature of the Challenge has stopped that being official I imagine.
If it were me I would want to encourage: new routes, imaginative routes, routes through the wildest bits, exploring off the main paths. I think that Martin's route is that sort of route. It is however the opposite of what many want from the challenge which is to, more than occasionally, meet other challengers walk with them a bit, divert to other watering holes and meet some more.