I think most people will say the Mastad is the best for wind protection. Some do not like the looks and they are one of the most expensive but well worth it to me. Had a Klock Works which was not very effective. If you look at some of the newer bikes the two piece shield is gaining in popularly and I think it is because it is effective. Also look at "for sale" windshields, often many brands are offered for sale as people look for the perfect shield but seldom is a Mastad because Mastad ends that search.
+1 Yep the best in performance, not so much in looks
2015 Matt Grey F6B Deluxe - Gloria
2011 BMW K 1300S - Stella
2000 Triumph Sprint ST - Trixie
2000 Ducati Monster 900 - Monster
1985 HD FXRS (Still in the Shop as a reminder) - Frita
1984 HD XLX - The First