Incalls for me. Much easier for me.

outcalls, most definitely.

Incalls simply makes it too easy for LE to hone in on providers, especially if its location hardly ever changes.

Just about every LE raid that I've heard about focuses on established, non-changing incall locations.

Incalls for me.

For a local resident, an incall is almost essential because clients with SOs or wives are not likely to have a spot to host the encounter, and many providers are (wisely) reluctant to come to the house of a client with whom they have not met before.  

For visitors - the prototypical man-on-a-business-trip - outcall to his hotel room is often preferred.  The visitor may not have a car, for example, and while getting a cab to an incall site may not be a hassle, getting a taxi from the site certainly can be.

I prefer private outcalls. If I'm seen at an apartment complex its easier to explain than if I'm at a hotel.