I was also split between these two but couldn't get the 649 to work on my face.
Someone recommended me the Persol 2931:
They're quite a bit smaller and easier on the face, but still look a wee bit bit like the 649.
The lens don't have that tear drop shape which prevents the 649 from working with most people.
In the end, I bought both the wayfarers and the 2931s.