Mine would have to be the Black-capped Chickadee for sure. LOVE those little birds and they were the first bird to get me interesting in birding. I had one singing it’s spring time song at 5am in the pitch dark and it woke me up. It did it again the next day and it took me a week to realize what it was and I then proceeded to put up bird feeders.
I also love my Carolina Wrens.
You must live in the Midwest or somewhere thereabouts, because that's the only place that has both the carolina wren and the black-capped chickadee.
Now I envy you!
I forgot you said you lived in central Mass.
I thought the Carolina wren could not possibly be that far north, so I had to check my bird range maps. You're right.
The Carolina wren's range does (barely) extend into the southern half of Mass.
I LOVE learning new bird facts every day!