In the spirit of World Cup competition, we're holding our own tournament in search of the Better Stock Today. We're pitting 32 companies against each other, and you, the reader, will determine the winner.

Today it's the Quarter-Final stage, and Gilead Sciences (NASDAQ:GILD) takes on Vanguard Natural Resources (NASDAQOTH:VNRSQ) in our search for the better stock.

Bracket showing companies that advanced from the group stages

Motley Fool health care analyst David Williamson makes the case for Gilead to win this match up. He believes Gilead's Sovaldi will continue to beat analyst estimates and that its runaway success will continue. Estimated to do $1.4 billion in 1st quarter sales, the instant blockbuster clocked in at $2.3 billion. Gilead already has an even better combo treatment in the works and despite its high price tag, Gilead's future rivals don't appear willing to undercut its cost. With an estimated 150 million hepatitis-c cases worldwide, curing the disease will prove beneficial to humanity and Gilead shareholders.

Joel South, energy analyst at The Motley Fool, thinks Vanguard Natural Resources is a better investment today because of its mouthwatering yield and increasing payouts. In fact, since 2007, Vanguard Natural Resources has increased its distribution by 48% and with de-risked mature assets; unitholders are getting their fill of Vanguards 8.2% distribution yield.

Vote here to determine the winner of this match and sound off in the comments box below. Check back to Fool.com to see who advances in the tournament.