My favourite thing about air tools was not having to worry about batteries (most electric hand tools I've used are battery only so no opportunity to use an extension lead like you use an air hose)
For me, I like air powered tools because of their power and reliability. They'll almost always have more torque and power than similar electric tools.
When you start getting into 3/4 and 1" it's not even a comparison.
The cordless is nice to have but it's a luxury/convenience tool, not a replacement.