Gates belts are consistently good. I have had some Dayco belts last for ages, and others fail in less than 1 year of driving. The newest "W-rib" Dayco appears better than previous versions, but only time will tell what works best.
I almost always get Gates coolant hoses simply because they cover more applications. They seem fine, but I prefer OEM coolant hoses in most cases.
I'm not sure how good Goodyear belts and hoses are, because I rarely ever encounter any.
I often find that ACDelco is a gates or a Dayco product with ACDelco written on it.