Which member of the Fellowship could bear the Ring longest without being corrupted?

[The Saucepan Man]

I think Gandalf would be the best choice because he is the strongest member.

But Gandalf's own instinct was that he was not best placed to take the Ring. He refused it when offered it by Frodo. And, if he thought that he was the best choice, surely he would have done so (albeit reluctantly).

Anyway, given the terrible consequences had he succumbed to it, it would have been a huge risk to take. Surely even more risky than sending it all the way to Mordor in the hands of an unassuming Hobbit.