Well i can't limit myself to one favourite i have 2.

ozone 10m c4 fast, dynamic punchy. it fits the bill when i'm in the waves. i love to lauch the wave lips throw loops and also slash up the waves back into shore. c4 does and sweeeeet job in the sweet winds 18-28 knots.

flysurfer15m speed 3. the session saver and the kite to reach for when i want insane amounts of glide. on the days i feel like boosting to the moon and gliding forever the speed is the ticket.

If the conditions are right; my Speed 3 12m, for the same reason; High jumping + lots of glide.

This will turn out to be the pimping thread right? hehe
Well I have to say I have two favorites as well:

Best GP: - it´s so stable unhooked, and have a lot of explosive power in the pop, but still sooo much slack after. It makes passing so much easier for me. A powerful and stable kite but still, fast enough for catching you again in kiteloops. Simply the best unhooked kite I´ve ever tried!

Best Kahoona V4: - For those super gusty stong wind days, be course it soaks up the gusts and still make the session fun. It´s so playful! It´s has a lot of grunt yet the pivot turning makes it friendly and forgiving. This makes me want to ride the kite more aggressively and push myself even more. It is fast turning and you just have to boost and loop it. It has great downwind drift in the waves. And the relaunch is so easy there is actually no point in mentioning. It´s predictable, you always feel were you have your kite, and it always does just what you want! It´s a great allrounder and works for unhooked, waves, boosting... And again I have to say it´s sooo playful!