I'd have to measure a few to compare.
I do know that from the Many RSG hand guards I have that they seem to be the narrowest. At least the early Type I's are.
Agree the WRA and Marlin made stocks are beefy at the wrist. I've found that H&B stocks are pretty beefy also, along with Lumbs.
I've got my Grandson for another week+, might be a good project to measure some stock wrists while I have a few boxes pulled out.
If I do I'll get back to you.
Speaking of hand size, I used to follow a 3rd gen Wood Framer whose hands were so large you felt like you had a child's hand when shaking hands with him.
Back then I was taller, near 6'5" but now shrinking every year![]()
He'd face palm you with his fingers nearly touching on the back of your head.
Be Safe,