I'm not Deaf or Hard of Hearing. But as an autistic person, I feel like using BSL is less stressful than speaking.
I have difficulty processing verbal information due to my autism. If I am not looking at a human's face, it is more difficult to understand what noises they are making. Signing feels more natural to me, and reduces the things I need to pay attention to in conversations.
I am still at the toddler level of BSL, so I still struggle following a conversation in BSL. Especially fingerspelling. I hope by watching BSLZone TV I become more fluent. It is sad that I never learned the sign language of my home town. I feel like that would have helped with my communication skills.