Thanks for the answer, but I don´t ride a surf kite (board ) before... and my question, is more easy to learn with the 6,1" (more volume board to my weight and tall) or 5,1" board?? . I always ride in a 1 - 1,5 m. wave conditions.
Either of the models is great to learn on. I think you have to decide what and how you ride. I have the 6'1'' and 5'5''. If I ride lit up and want to go for more jumps I go with the 5'5''. For waves..even reasonably big waves. The 5'10 will be more a join between those boards. The 6'1'' more surfy. If you like to ride powered, I would think the 5'10 is a little better, but both models have both the 3 or 4 fin option so you can change up depending on the conditions.