MSBA show was the "best" one I have been to in the local area.
The Worcester show is almost the same each year.
The Springfield show has more gear for sale. It has excellant speakers (worth the travel just to hear some of them IMHO).
Flyfishing show in Marlboro, MA this Fri-Sun if any one is into that.
Another fly show in Wilmington next month @ the Shriners.