1. Super Nintendo Entertainment System
2. Super Nintendo
3. Super NES
4. SNES
Ok, #1 looks/sounds good at a stockholders meeting
#2 looks/sounds good in conversation/media
#3 looks/sounds like a post stockholders meeting party, and they're just too fucked up to remember the entire system name.
#4 looks like overkill/sounds like a bad Scottish accent for the word sneeze