Different circumstances come into play when deciding incall or outcall. Every person will have a different reason for choosing one or the other.  

I'm not a mind reader, I wish I was. So I can't help you out

. . . I used to always prefer outcall.  Now I tend to go with incall always.  Outcall is nice because you can just pass out after the girl leaves.  Now though I just sleep while I'm driving home and it seems to work out.