It's not an easy choice, and they could certainly get run out of the gym, but I'd rather see Iowa try to push the pace.
Trying to play a slower, half court focused game takes away Iowa's best advantage offensively and frankly does them no favors defensively either as they are a poor half court defensive team.
I'd take the chance on pressing, pushing the pace, giving up easy twos and trying to get 'zaga to have to rush back down court to defend the 3 ball. Maybe they can get some of their key players tired enough to be off on their shot and make mistakes.
We know Iowa is going to give up a lot of buckets. Why have fewer possessions and make each one more valuable?