Glorietta and ATC(Alabang Town Center) are well known, a lot of people have been there.
The Glorietta is located in Makati and ATC is located in Alabang, their locations are different as cost will differ too in going there.
The Glorietta is bigger than ATC as you can shop many things except theater, Glorietta doesn't have theater even bigger.
Another different thing is the Bus station, The Glorietta has that bus station so you can go home right away after you finish your work but ATC doesn't have that so you should go to other place to go to the bus station.