I had a child attend both McLean and Field, and I think McLean would probably be a better fit. Field is a lovely, lovely school but sometimes the kids with social issues can struggle. McLean is just better able to support its students, in the classroom and out. Field is open to different learners, and is more academically challenging than McLean, but the McLean upper school is quite good. McLean has much more structure -- also good for a child with the issues you describe.

I like both schools a lot. McLean is more accommodating, Field is somewhat accommodating. Visit both and be honest with yourself about what your DS needs. My feeling is that school shouldn't be a stretch.

I have a high school age son with significant ADHD who struggles with social skills. He needs an academically challenging school that will help him with executive functioning. Most importantly he needs to be in a school that his poor social skills will be accepted. He just talks too much and has a poor filter. Thinking of commonwealth, field or McLean. I personally lean towards field for him due to the kind atmosphere.
Advice?