The answer can be found by visiting each product description page on Nintendo's website, and comparing them:
Deluxe Edition
Start your adventure with the full first collection of the Starlink Fleet to defeat Grax with the Starlink: Battle for Atlas™ game, 6 Starships, 10 Pilots, and 15 Weapons included.
Start your adventure with the full first collection of the Starlink Fleet to defeat Grax with the Starlink: Battle for Atlas™ game, 6 Starships, 10 Pilots, and 15 Weapons included.
* = These are also available as DLC in Collection 1, for those who own the Digital Edition
Starships:
- Arwing (Nintendo Switch version only)
- Zenith
- Neptune
* - Pulse
* - Lance
* - Nadir
*
Pilots:
- Fox McCloud (Nintendo Switch version only)
- Mason Rana
- Levi McCray
* - Judge
* - Chase da Silva
* - Hunter Hakka
* - Shaid
* - Razor Lemay
* - Eli Arborwood
* - Kharl Zeon
*
Weapons:
- Flamethrower
- Frost Barrage
- Shredder
- Iron Fist
* - Crusher
* - Shockwave
* - Hailstorm
* - Levitator
* - Volcano
* - Imploder
* - Nullifier Missiles
* - Freeze Ray Mk.2
* - Shredder Mk.2
* - Gauss Gun Mk.2
* - Meteor Mk.2
*
Collection 2 Pack
Starships:
- Skullscream
- Vantage
- Vigilance
Pilots:
- Rankor
- Fern Wilder
- Galla Joust
- Startail
- Haywire
Weapons:
- Tidal Wave
- Ice Mine
- Jaunt
- Gauss Gun
- Fury Cannon
- Freeze Ray
- Meteor
- Levitator Mk.2
- Volcano Mk.2
- Imploder Mk.2
- Nullifier Mk.2
Star Fox Team Pilot Pack
This DLC is, as far as I can tell, only available for the Switch version of the game.
It adds the characters:
- Falco
- Peppy
- Slippy