Regarding the OPs title question...pan or ball head?
I am satisfied with having both. I have a 40 year old 'cheap' tripod then (all aluminum, well made by todays' standards) with a pan head on it. For the occassional use it gets (5-10 times per year, mostly for occassional ebay sales), it suits me fine. In years past, I did a bit of panning with it, and it was stable enough to support two 35mm SLRs with longer lenses mounted on it with a T bar.
For my monopod, I use a ball head. Quick flexibility and single knob adjusting to any orientation. After first getting a cheapo ball head for it (about $50, as I recall) I soon discovered it couldn't support my 60D with 24-105 mounted, and a 580 EX II on a bracket as well. So I went for 'overkill' and bought a Kirk ballhead. It'll support a tank! Good thing I did. I recently upgraded to a full frame, magnesium body camera and grip and it is noticably heavier!
I'm not telling you to go out and get a $500 tripod and $500 ballhead. But be sure that what you do buy will support your camera, heavy lens, flash, and a bit more...or you'll end up replacing it with something that will.