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can someone address this?
Do you want somebody to address the root question, or your inability to find the answer?
The answer to the former is "whatevs", there are pros and cons to the main options (sintered or resin bonded) which you'll have to decide for yourself. OE Shimano pads are fine unless you think they aren't, in which case good quality aftermarket pads are what you need.
The answer to the latter is that I don't think the question has been addressed before, so there is nothing to find.
I can't seem to retrieve the most recent recommended/approved M515/M525 brake pads with the search function, can someone address this?