He is neither of those breeds. He is a silver tabby Domestic Long Hair, and every bit as special & unique as you thin khe is. If I had to state any breed that he does resemble, it would be a Maine Coon.
But he's a domestic mix, that's what he is no matter what he looks like.
A purebred must have registration papers. You can only say "he looks kind of like a ragdoll".
But that's about it, he's not a purebred. Purebreds come from breeders.