the main difference between those two plots is the thorney one appears to spike the torque up which it holds onto for marginally longer up the rev range, hence the slightly higher bhp figure.
the difference is marginal, ie the sort of difference youd expect to see going from one dyno to the next.
of the two plots, the courtney one looks like the more civilised usable power delivery. it doesnt spike up so badly. the thornley one looks almost verticle between 2k-3krpm, which will make it feel "nippy" (20vt) style and give spectacular wheel spin and the tyres dont know what to do with the arrival of the massive torque.
so given there is almost nothing in it between the output figures, id be inclined to go for courtney based on the torque plot looking to be more useful. looking at the thorney one, it looks like a massive rush of torque followed by exactly the same drop off as courtney. the courtney one is better before the spike... so id go for courtney