I'd go from Providence into South Station. Then take the Red line to Park St, and the Green line to Arlington.
That's how I do it when I need to take the train into that area, except I go out of Mansfield.
Driving into Braintree is only a benefit if you're going into and leaving Boston during non-rush hour times. If you drive to braintree, you'll still hit a ton of traffic at the 95/93 split, stop-and-go on 128, then about 20 stoplights. I find Braintree is only beneficial on weekend trips to avoid paying to park, but even then, it's become extremely difficult to find a spot that isn't residential only.
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