I'd say it depends on team needs. Ichiro will offer better avg and steals while Rasmus will bring more power and rbi potential. Runs will probably be close with Ichiro maybe getting the edge but if Rasmus goes back into the #2 hole then it will be a wash (for runs scored).
If a non keeper then I'd probably roll with the more consistent Ichiro.
20tm dynasty 5x5 w/BB,HLD
5 SP,3 RP