Windows 98.
Switched to Debian. Needed to dial up on the command line. Awesome but sucked at the same time.
Soon switched to Red Hat. Meh.
Quickly switched to Mandrake, back when they had the yellow star logo. Was Ok.
Then switched to (Open)SuSE. Stayed with it for a few years. Was good. Even had an account on the wiki etc
Then switched Ubuntu. Wow - finally a distro that worked out of the box. Remember, that was before all the Ubuntu Pro and snap bullshit. Still on it because when it works it works, but when the current LTS goes out of support, I’m off to Mint or similar, haven’t decided yet.
Would be cool if Warsaw was called Po though