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.
95% of all cats are moggies(randomly bred non-pedigreed cats) and moggies are the most popular cats in the world. Isn't it absolutely amazing the huge variety and selection of color patterns, sizes and shapes they come in? There is no limit. And there are a lot of moggies that look very similar to pedigrees.