Airflow balls are fine for confined spaces, they give you a target, a focal point if you like. They also let you experiment with ball position for creating different flights.
Personally, I'd either use real balls or the 30% distence balls. Both into a chipping net or a full net. The advantage of the 30% balls is that they scuff easily and leave a bit of themselves on the groves of the clubface. Therefore letting you know exactly where on the clubface you've hit them. They also have some feel, which the airflow balls don't.
The cheap 30% balls are okay, but the pricier ones are far better. The ones endorsed by Dave Pelz.
Naturally, we do sell both! Oh, and a range of nets should you be interested.
Me hawking. Never!
Anyway. I hope the info is useful.
