These metals stocks are very different, but one is a clear winner.When it comes to metals mining companies, Australian stalwart Rio Tinto (RIO 0.58%) and Canadian start-up The Metals Company (TMC 1.74%) couldn't be more different. Rio Tinto was founded in 1873, while The Metals Company didn't go public until 2021. Rio Tinto has a $114 billion market cap, while The Metals Company's market cap is just $2.5 billion.But there's one quality these two metals companies have in common: Both are trading significantl ...