Answer. So Roy can choose one?

It depends. "Famous" is a stronger word. My grandmother was well known for her cooking, but it would be awkward to say she was "famous" for it since it was more of a neighborhood thing. I wouldn't use "famous" - written or spoken - unless the person was recognized for something among a lot of people spread out around a large geographic area. Either would be understood the same way though - it's just a question of which sounds more natural.

I use them both in spoken quite a bit.