I would add that compared to race kites, a medium ratio kite has a better fly and pull during all turning phase.
Race kite has more pull in straight line , Indeed, but its pull comes close to 0 when turning (loop or just working the kite to accelerate). And in m'y expérience it kills your acceleration (for exemple when you need to make several loops to foil up or if your lunes are too short.).
I speak from my light weight rider point of view.
Made some interesting comparing test between standard pulsion (15m and 18m) and "s" version (16m) which is bit closer to racekites : i could ride in lower wind with the lowest aspect ratio of the 2, also in steady winds. All same cloth , weight and Line length.
Same conclusions for pulsion 12m vs pulsion "S" 12m.
And same conclusion for pulsion 15m vs elf joker 15m.
PS: fully agree with Peter "judgment" of kite medium ratio models. Peter , you should try a pulsion 18 on 30 m lines one day if you can...