It depends on your scoring system. Without that, I'd say Pujols only because there is pretty good depth at 3B this year.
-Tom
EDIT: Remember, Chad Tracy is playing 3B this year, so even though he doesn't show up as 3B on Yahoo, he'll get eligibility within the first week of the season. So he could be a good power option at 3B if you take Pujols #1.