I think the B6 would have the lowest bar pressure (based on a B5) 12m. Then the cat, then the wainmen (say 12m which I have flown) and the lithuim the most, but again this is based on a 10m and 14m lithuim 2012, without that new light bar pressure leading edge connection. Can't comment on that. The lithium bar pressure was a bit much for me. Funny thing my mate who uses the 9 and 12 rabbit, smoke and boss respectively for quite a few years (he is one of the better riders around here and kills it on his day, we have a ball trying to push each other, btw I reckon he just has the wood on me, lol,) has complained about the bar pressure and is considering a change of quiver after winter. Looks like another round of demos!! Ha ha.
But I personally think it may be a function of wing design, I felt the the rabbits power delivery was a bit 'muddy' and on reflection I don't think that is quite right. The better answer would involve the lower aspect kites like the rabbits and lithiums pull you more downwind and hence you have to edge much harder against the pull. This causes the fatigue he is feeling. Not quite sure on all of this though.
Waves is hard to comment until this winter really. The rabbits are an excellent wave kite and as an all rounder wave usage is its forte in my mind. The B5 was no slouch and some people are raving about the B6 in the waves. The lithium likes powered riding in my mind, great for dog styling in the waves, park and ride not bad. I still couldn't get passed that spongy steering though pulleys provide. But that's just me I'm sure crew adjust reasonably well.
The new cat is still an unknown. We haven't really had any decent swell with wind yet. But among us we have cats and reos so by the end of winter will be able to make a much more informed opinion.
None of those kites though turn like a REO when depowered. That is the essential criteria only a dedicated wave kite can produce. But for this wave rider pretender (I'm only riding it in so I can boost like a madman on the way out

), the cat is good enough. Infact the edge is good enough for me most of the time, but I'd hate to be in double head high in 20 knots plus with current on an edge! That's where the edge would be downright dangerous I reckon. Lol. Oh sh1t I've stopped, here comes the wave and where is my apparent wind. Aaaaahhhhhhh