HV oil pump vs Stock oil pan

Your choice. If not required by the chosen components, all you do is pump more oil which wastes HP and heats the oil. Your results may differ, but I go by experience.
It's been proven many times that the hp thing is a myth, I also go by experience-my own as well as alot of guys much smarter than me. The argument seems to be if you can "get by" with something at the bare minimum it's good enough, that may work on a stock engine but when it comes to a performance engine it's a great way to find out the weaknesses.