I used to have a pan and tilt but I gave it away as the arms were long and I wanted something more compact so I got a ball head.
The big down side for me is that no matter how careful I am there's always a bit of drop when I stop fiddling with it. I do wish that I'd kept the pan and tilt...
I also have a geared heard which avoids the drop problem and can be positioned accurately but it's big and heavy.
So, after trying and buying without really careful thought I'd advise anyone else to try and think of the + and - points of each type of head before buying.
Personally I think that a pan and tilt is probably worth the hassle over a ball.