Looking at the elevation profiles, it seems like Pengwern Pedal has more climbs, and it's hillier overall. Probably an easier finish than the Elenydd though - the last 50km are all downhill.
I've not looked at the numbers yet, there was a reasonable downhill run to the Elenydd but the temperature was hovering around -2, took the fun out of it a little...
Sweet! Rode Yr Elenydd and enjoyed that, expecting this to be similar.