I am inclined to agree with the Jumbo Jet (thetallguy747), I shy away from plus arms unless they are stone OPS guys but I would be inclined to take Dykstra, Ashburn just doesn't have enough pop for a guy who is not a big base-stealer, my opinion.
dykstra has always underperformed for me whereas ashburn has always done well... i've tried dykstra in many settings and he never comes through... i'm done with him...