Who should I have as my utility man?

For now, Rasmus. He's had the hotter bat thus far this season, Rasmus has better numbers than Young in pretty much every category. In addition, Rasmus is on the better lineup, with Pujols and Holliday next to him in the lineup, he'll get plenty of RBI and runs. You'll want to adjust who to start each week accordingly though as one of them might cool down and the other might heat up. But again, in the short-term, start Rasmus.