I would go with 256. I use a NAS too, but the local space is good for performance. I can edit files locally to get all the benefits of the SSD speed, and then move them to NAS when finished primary work with them.
Also be aware that the Pro* has 3x3 wifi, while the Air has 2x2. So the potential throughput to your NAS is 66% with the Air vs the Pro.
*Except for the nTB Pro, that is also 2x2.
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I would go with 256. I use a NAS too, but the local space is good for performance. I can edit files locally to get all the benefits of the SSD speed, and then move them to NAS when finished primary work with them.
Also be aware that the Pro* has 3x3 wifi, while the Air has 2x2. So the potential throughput to your NAS is 66% with the Air vs the Pro.
*Except for the nTB Pro, that is also 2x2.
The OS takes around 25GB.