wich is the best for bugguying ? i can't make my choice

Beamer will fly more steadily (good for beginners).
C-Quad will produce more power and speed.

Between these 2 kites, I would suggest the C-Quad if you have some flying/buggying experience. If you are new to the sport, the Beamer may be better to start off with.

Here's a tip, the location of the in take vents, shuld be on the bottom of the kite. The Nagative side of the kite, Witch creats a Negative pressure on the inside of the kite. Negative pressure create's lift, and more pull. with the vents in front, the kite is way more forgiving, with less lift and pull.