My first choice is JB..but, if I can't get the fare or times I want, I'll go with SW. I don't mind flying out of Logan so JB really works for me. I love the seats, the tv's, the FA's....we've had very good experiences to date.
We have to drive an hour to TF Green to use SW, but they have always left about 5 minutes early, and the experiences have been good. I just keep hitting the seat in front of me...looking for those TV buttons..nothing happens!!!
Have to say that with both these airlines, there are very few flight changes to deal with. Now, that's nice.