PEI:
With respect: Your answer may be enlightened and accurate, if confusing. I'm teaching low houred ab-initio jet pilots. They want a simple rule with which to start their career. Is it A or B? My answer, being a simple fella, is that if the G/S is flight checked and approved, and if that is what the autopilot will follow when IMC, so thus you believe and accept it, why not do the same when visual?
In my mind that is a simple answer to the question at 500', "what shall I do?" Unfortunately, but the time I've explained your theory we are either half way down the Rwy or in the approach lights. Excuse the flippancy, but young guys need quick simple answers.
And that's before I even begin to wonder about dual PAPI installatons which do not agree with each other..