Certainteed is the best brand of shingle made today. I recommend them to all my customers. GAF has had countless problems in recent years. Don’t know a thing about Mularkey?
Excellent advice, and spot on.
I would add, Malarkey are quite good, well ahead of GAF, but Certainteed is what my roofer likes, so what I use. ROOFERS like 163bc KNOW.
I've had horrible issues with GAF and will NEVER use them.