Differences between Bair, Nair, and Ice Fair

[DrKnockOut]

These aerials all deal 14% (assuming all bairs and nairs sweetspoted), and they all seem to have similar knock backs, at least at low-mid percentages. Is there any advantage to having an ice fair over a nair? Is there any reason to opt for a bair other than when the opponent is behind you? Is it better to stick with the fire fair because nair does the same thing as ice fair?

 

[Narpas_sword]

pretty sure nair and ice fair hit at different angles, and a different speeds and nair doesnt have the forward reach that fair does

 

[Chevy]

Sweetspotted b-air has much more knockback than n-air or ice f-air.