Lots of kiters warned me that its not really comfortable to surf with this kind of kites... And that they are cumbersome and big and really hard to maneuver....
It's all tradeoffs. If you want to get out in the lowest amount of wind possible, these high aspect kites (speed, dyno, edge) are the best, but you give up turning speed.
These kites aren't as good for surfing because of the slow turning and generate a lot of power when you move them. They are great for raceboards and for big jumps with lots of floaty hangtime.
The lower aspect kites (fat lady, infinity, core riot) will turn faster, but you give up a little low end, maybe a knot or two.
At 72 kg and 10 knots of wind with a large surfboard, these lower aspect kites should be good for you. If you want to go out in less than 10 knots with a raceboard or jump big at 10-15 knots, the high aspect kite is the way to go.