I always have bought re-built pumps and prefer one to be an original GM. At the parts store we'll go through a few boxes till I find one I'm happy with. In the last 50 years, I've had pretty good luck with them.
Some products out there that used to have a great name, is not necessarily the case today.
Ask me about Troy-bilt.
I've always known them to be top notch and have had great luck with a couple of their products I bought years ago, but not the last recent two. The worst one was a new Generator. Not only did it quit working, their new customer service was horrible. I later learned that they sold out to this new outfit, which sure explained why.