I have a Bogen 488 RC2 ball head and I love it. I also have a very cheap, plastic 3 way, pan/tilt head on an equally cheap tripod from walmart. I realize I'm comparing apples to oranges as far as quality goes between these two, but the fact that I can move my camera to any positon by loosening a single knob, vs 3 seperate knobs on a pan/tilt is a HUGE plus. The pan/tilt head takes too long to get everything the way you want it.
"I thought that because fewer wolves meant more deer, that no wolves would mean hunters' paradise. But after seeing the green fire die, I sensed that neither the wolf nor the mountain agreed with such a view."
Aldo Leopold
Ball head. I do have a good but inexpensive (Bogen 3025) 3-way pan head that's very sturdy. I haven't used it in about forever, but if you only want to adjust one direction at a time it's the way to go - architectural photography would be a good thing for it.
It depends if you going to do architectural or panorama photography then you will need a pan-tilt head. If you find you like doing panorama photography you will end up buying a specialized tripod head. Other than that it's personal preference.
BUT buy a sturdy tripod with which ever head you end up purchasing.
GRF
Panorama Madness:
Nikon D800, 50mm F1.4D AF, 16-35mm, 28-200mm & 70-300mm