I am not a fan of taxi in Manila or anywhere in Philippines. Taxi ONLY if there is NO alternative.Instead of going all the way to Buendia, you can get off in Magallanes and it is a short ride to T3 by taxi
I was on Gold Star bus and the first stop was Dela Rosa and then Buendia, I believe the bus terminated at PITX.
I have been on bus to Manila only made one stop at PITX.