Each to their own as far as LW kiting goes.
I wanted to maximise any opportunity I could get on the water and went with a 17m Zephyr, my other kite is a 12m Cab SB, and im 105kg.
The Zeph has a very good wind range, top end and handles gusts well, admittedly its a big kite, turns fairly slow, but it gets me out there when too light for my 12m.
So for me its about time on the water and progressing my kiting.
As far as top end goes, it overlaps well with my 12m, as I dont get on my 12m until its around 15knts. And this is why I went with the Zeph over other LW kites.
Yesterday I was at Wello from 10:30am to 3:30pm, spent the majority of my time on the 17m. I only swapped to the 12m at about 1:30-2pm, in retrospect I should have down sized a lot earlier as it did really kick in and some narly gusts came through. The winter westerlies, very gusty, dropping in and out, were a bit of a handful at times, but were manageable on the Zeph.
I'm hopeless at estimating wind speeds, but the 17m was out in gusts well over 20knts id say.
Yes yes i should have been on my 12m in these conditions, but it was changing constantly, and would rather be overpowered on my 17 than under on the 12.
Yesterday's readings from Peel and the Airport below....probably explains why Im so sore today