Breast pump

I’m trying to decide if I should go with the free breast pump that I am able to get through my insurance or if it’s worth the additional $150 to get the upgrade to the portable one that doesn’t need to be plugged in? The two I’m choosing in between are the medela pump in style and medela freestyle. I teach so I won’t really be able to pump at work, but being able to move more freely in the house seems like it may be worth it to me. Thoughts?