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The MacBook Pro's power adapter, like that for most electronic devices, does not care; it accepts anything in a range of 50-60Hz. You can see this on the label of the power adapter itself.
The pieces in the World Travel Adapter Kit are just plug adapters; they don't do anything to adjust the electricity coming in, but just fit different types of outlets used around the world. It's the MacBook Pro's power adapter that cares about the voltage and frequency of the input electricity. Fortunately, the adapter is a universal one, so it accepts a wide range (100-240V, 50-60Hz for the one I have right here).
So the short answer is that you should use whatever plug adapter physically fits in the outlet you're dealing with. In the Philippines, you should find both American-style two-blade outlets (though they are 220V, not the 110V found in the US) and Central European-style two-prong outlets, also ~220V. It's hard for me to tell what you're describing as "thick-rounded" and "thin-rounded" without a picture, but only one of them will physically be the right size.
If this picture is accurate, you'll want the type C ungrounded "round thin pins" used in most parts of Continental Europe (along with the North American "flat parallel blades with holes"), not the "round thick pins."