Incall vs outcall
Anyone who has been around the block a few times has noted thoses hits.. and misses. Outcall girls are more action prone and unpredictable, IMHO but YMMV.
The key is to be a player, without getting shafted (I hear the laughter
). If you have a tough time turning down anything that is less than you are willing to pay for, you might have a tough time walking away from and incall after going out of your way. Outcall my be a more favorable setting - they come to your hotel, easier to politely turn them down and send them on their way. Reputable agencies will not make too much of a fuss of that, it's part of the business reality.
Outcalls are clearly much better looking on average, and as many have said, as far as incalls there's the fast food flavor to them... outcalls might be more unpredictable and wild. You can only know what's best for you