This is always ‘the’ question every kiter asks several times a day and will probably get different answers each time as there is no truth here. It depends on many factors; obviously, the wind strength and your weight matters but not only! Wind density will also be a key factor even if not many people are aware of it. A colder wind will be stronger than a warmer wind of the same speed. The size of the kite will also depend on your riding style. Are you more a strapless rider (smaller kite) or a freestyler on boots (average kite) or an old school rider who wants a bigger kite to stay more time in the air? The length of your lines also has a great impact on the power developed by your kite
Below are a few excellent options