It depends on what you really want to do.
From what I have seen over the years, is that AMD is usually the choice of gamers, while Intel has been the choice for people who multi-task a lot, and run programs along the line of Photoshop, premiere, Cubase.
AMD= Gaming processes
INTEL= Production processes.
AGP now is somewhat outdated, and I would choose PCIE2x16 over AGP with todays products.