Frieza probably wouldn't last a 100 episodes trying to defeat Goku.
Android 17 wouldn't last one second fighting against Vegeta.
Krillin would probably hang back instead of constantly fighting on the front line.
Future Trunks wouldn't be able to slice up Frieza in half.
Piccolo wouldn't be able to trash talk Kami.
Vegeta would never go Super Saiyan.
Gohan wouldn't be able to live up to his father's legacy.
And Goku... Well, Goku would probably still be a total badass.