I heard opinions that if you don't want any CPU/mobo compatibility
issues then buy Intel/Intel.
Talking about comparable models, AMD is more overall productive, while
Intel is more powerful in calculations-heavy tasks, such as 3D
rendering.
Personally I have AMD 64 - they are cheaper, will allow me to play with
64-bit Windows when it comes to existence (beta already there), and I
plan on upgrading anyway when dual-core CPUs will arrive.