How tall are you? Your height plays an important role in wind deflection and whether you'll end up with more or less buffetting.
I'm 5'10", and have tried the following shields:
Stock, don't remember anymore how this serve me since I got rid of it within a month of getting my bike 5 years ago.
CalSci, great for highway rides with less turbulence specially when passing trucks.
Puig, seemed to have a nice windflow towards the chest with acceptable wind noise.
Currently using Givi 440D, has a little extension on the sides which works like wind deflectors for your hands. This is great for cooler than usual rides. Wind noise is acceptable. If I want complete silence I only have to tuck in a little without being uncomfortable.
Of course helmet design also plays to how much noise you're getting.
I'll try and take some pix of all the shields for your visual pleasure. Right now I'm enjoying my Givi shield.