Every summer for the A-list is yacht season. Naomi Campbell recently shut down pregnancy rumors by posing strategically on a yacht, and even the Real Housewives can’t resist a nautical moment. But this summer, it looks like we’ve officially got a case of dueling yachts to unpack, and it’s all thanks to the 70 million dollar vessel owned by media mogul Barry Diller and the 590 million dollar boat owned by studio executive David Geffen. If you look closely, each yacht has been the site of some of the most A-list celebrity meet-ups you could imagine. It would be so difficult to decide on which yacht one might prefer to spend a lazy summer day—Karlie Kloss is a frequent guest of David Geffen’s, but she most recently took a photo on Barry Diller’s yacht with Harry Styles and Diane von Furstenberg. Diane Sawyer, Paul McCartney, and Bruce Springsteen are just a few of the talent to grace the 454-foot deck of Geffen’s “Rising Sun” (which also reportedly has a basketball court, by the way), while von Furstenberg and Diller’s “Eos” has played host to Bradley Cooper, Gayle King, and Oprah Winfrey. With rosters as dazzling as those, whose yacht would you rather party on?