Mht
I fly for NJA out of MHT. It cost $385/yr for the crew lot which is walking distance to the terminal. You can take flightline to BOS terminal for $20? or so with your id. BOS parking is more, but I haven't flown out of there in 2 years. I did all the deals. You can park at a hotel off exit 45 from 93 for free and take Flightline for $10 each way and there is also Logan Express, or Paul's has a discount for cremembers. Going to the Logan office and get a parking at the chelsea lot for a month or by the book in the old days.
MHT has less flights. I say BOS for more options if you are a commuter. I'm sure glade I don't have that headache anymore!