What cologne should I buy?

I was checking out Polo Black and I keep getting mixed reviews on it. Some make me really wanna buy it and some make me really wanna ignore it. I am going into High school and I don't want to smell like an old guy or something. I have a bottle of fierce from Abrecrombie so it's not like I don't have a great smelling cologne to back up Polo Black if I get it and it has a terrible result