Beauty is truly in the eyes of the beholder. I believe there are distinguishable differences between the GAF and Certainteed Weathered Wood shingles. I personally prefer the Certainteed version of weathered wood based on color. FWIW, I also personally prefer the Certainteed shingles over GAF from a quality perspective. Both of those statements are a perspective based upon my own personal opinion.
Weathered Wood is an earth tone shingle and should go well with most browns. Why don't you take a sample of each and hold them up at various places around your house, in the sunlight, to form your own opinion?