Of the two breeds you listed, I would pick the Bulldog. I have known a couple of Boston Terriers, and they were yappy and annoying.
I would get a Boxer if I were you. But I am biased...
That's my boy, Sirius. Boxer's stay medium sized so they aren't too much or too little. They can be very energetic, but they also like to chill. When you leave the room for a while, and you come back, they dance around like you have been gone forever. Boxers "talk," using deep growls and smacking their lips. It's hilarious, and I could swear a couple of times Sirius has told me to f-off when I am annoying him.
I will never own another dog unless it's a Boxer. They are that amazing. Mine is a white boxer, but they aren't rare. Because Boxers are half English Bulldog, they have the same genetic coloring as Bulldogs. The only difference is, white Boxers can't be shown in dog shows, so breeders used to kill them at birth. That is pathetic. Reputable breeders are now selling white boxers as family pets, but they aren't allowed to charge as much for one as a brown and white Boxer.
Anyway, good luck with your decision. Whatever you end up getting, keep the dog inside. Chaining dogs outside is ignorant.