I prefer to do removals, basically due to the fact that there is no grey area in the end. The tree is a stump no matter what. With pruning you get "I thought", " I woulda", "I wanted", which is a PITA after your on the ground and have cleaned up no matter how much you've explained to them in the beginning.
I enjoy doing pruning though, the climbs are fun, and the finished product is something to step back at and take in the site. Plus the fact you'll more or less be back to the site to take care of it in the future. Where I used to work we did 80% pruning, it was def. a more gratifying experience. The days all I do is slay 'em, I do very little pruning even after attempts to get a customer to due so.
Another side of things, removals is kinda multi step, climb, lower/dismantle, come down, buck wood, load logs, rake, blow, dump debri, blah blah. Pruning on the other hand, there is relatively little debri, chip some brush, rake, blow, not enough chips to dump, you know the deal.
That's why I enjoy doing pruning.