No, no, no, you're all wrong! Well, some of you, many of you are right.
Super Wing Commander contains all of the WC1 missions, all of the SM1 missions and a new set of missions set between SM1 and SM2. It does not include SM2.
The graphics are entirely redone, to the level of Privateer. All the characters, backgrounds, ships and cockpits are all new graphics. The cut scenes are in different places, and show different things. They're entirely 3D.
It was released on the 3DO and the Mac.
The Goddard scene in SM1 was original to the SNES version.