I use both. When working with my preferred way of recording these days, the Spire Studio, I use the iPad Pro. For other projects, the MacBook Pro has more memory and processing power.
Working on some mixing today...
I'm mixing some files on the Spire Studio with the iPad Pro in my hands; the MacBook is to my right.
For the record, the Spire Studio has changed the way (and ease) I record, and it uses iOS for an interface. There are limits (8 tracks and no adding effects after the track is recorded), but it is SO easy to use.