Oh there's no debate, not in my mind anyways.
The very first scupper I ever had worked flawless for over 7 seasons. It was a cheap 1" plastic plumbers one from lowes and was mounted inside the engine bay. I used to jump on my buddies boat and leave my ski floating in the middle of the lake for hours without giving it a second thought. When I redid my hull I replaced it with a proper 2" scupper and it would sink if you stopped moving for more than a minute and was full every time you went to drag it off the beach.
I have not installed a scupper in a single boat since and honestly, it was almost a deal breaker on this one. Dual scuppers and a front exhaust cut out are two blemishes I am really not happy about but hey, I got a smoking deal on the hull. I was willing to give it a go, knowing I could plug the holes and add pumps at any time and they let me down the second time out.