I have tried both. The one in my avatar is the dark one. It came with the shield when I picked it up off another member here.

Although I look over both shields, I found that I still like being able to see through the shield for close-up stuff, so I run the clear one 100% of the time.

That said, the dark shield looks nicer on the bike, so if you're a victim to style, you'll want that one. Everybody's needs are different.

YMMV.