Pretty much every early Amiga game that was also on ST was ST first.
Exceptions were Psygnosis, and obviously later Team 17.
1992 onwards and most games led on Amiga.
It'll be a massive list for sure. The Atari ST in a way was very detrimental to the Amiga.
Whilst Ghouls n Ghosts was an ST port, they did actually improve the music for the Amiga version...... its still revered as a classic today.