A recent Benzinga poll pitted Warren Buffett, Elon Musk, and other renowned investors against each other, asking readers to decide who will go down as the most legendary investor in 100 years, as both billionaires have helped grow companies into market capitalizations of $1 trillion. What Happened: Elon Musk has helped transform SpaceX and Tesla Inc (NASDAQ:TSLA) into two of the most valuable companies in the world, which might explain why investors continue to believe in his companies and future growth initiatives. While Tesla may have reached a market capitalization of $1 trillion in less ti…