To Olaf or To Trundle?

Which one should I pick up for a split pushing/teamfight juggernaut top lane? So far I've been liking Trundle, but Olaf seems decent on paper, particularly since he can offer ranged slow, self sustain, and unstoppable condition.

For reference, I'm decent with Darius and Illaoi, but they don't split push or team fight that well (at least it doesnt feel that way).