This is an easy one. Get one bundle of each and lay out a few ft apart on your roof. Make your choice. Problem solved

I don't know about the Certainteed, but here is our Tamko Black Walnut.

What you see in this picture is how it looks on a day with some clouds. On a bright, clear day, it is just a hint lighter but not by much.

Hope this helps.

That's actually not a bad idea toomuchtime, but I don't know who would be getting up on my roof, it's pretty tall and steep, so it won't be me or hubby!

kcthatsme, thank you for the pic, it does help! Would you agree that it pretty much matches the pic from Tamko below?

Here is a link that might be useful:

Your Tamko picture was definitely taken on a cloudy day. Here is how it looks when it is brighter outside and sometimes even slightly lighter. I can tell you that I'm very happy with this shingle color.