What do you want to do and what gear do you have already. The functions of a computer based DAW (there's nothing special about a Macbook) and the Integra are pretty different. Your question is a bit like "should I buy an apple or an orange?"
With the computer, far more important than the choice of hardware is the software you plan to run. A Macbook (or, indeed, a top level Windows machine) is useless until you add DAW software. However, the Integra is much more about being a MIDI sequencer.