I never owned an Amiga. I had a used Atari STFM from a friend who bought an Amiga 1200. I spent a LOT of time on both machines, but of course favoured playing his Amiga 1200.
There will never be a gaming experience anywhere near the Amiga. The Atari ST was pale in most every respect. Though I did like it.
Oh yes, and I used to brag about Oids and Super Sprint.