It's not about heat resistance of the pad and its mu throughout the heat range. It's about which pad would generate more heat and potentially overheat the bloody Brembos with its small rotors! It's tricky to judge, because in theory the harder pad should absorb less heat (so should not heat the calipers up that much) but it has a higher mu, therefore can generate higher temps. So, which one?
PS. I was told that the wet boiling points are more important than dry as even fresh fluid would have some moisture in it. True?