AGP better? Why, how, and what glue-sniffing cretin said so?
PCI-E x16 has more bandwidth, and more important it is the connector that most high-end cards are being built for.
AGP vs. PCI-E doesn't matter if you're buying a $100 card and never plan to upgrade, but if you want to buy a $450 card now or upgrade to even a $300 card in a couple of years, PCI-E is the better choice.