What are some reasons to pick Sublime Text over Zed for someone not familiar with either?

For me? I already have Sublime Text installed, it works great, and has never not worked great.

Sublime text is what notepad++ wished to be. There are many tasks that do not require a full IDE, not even vscode and sublime just works. Always, consistently, reliably works, is fast and a joy to use.

Zed pretty much copied everything over from Sublime, so it's pretty much on par. Sublime was one of the first editors to have an uncluttered UI without toolbars, but with advanced features, like multi-cursor editing and the command palette. As a long time sublime users, it still feels superior as it gets lots of small details right, like for example when I do Cmd+P to search for files and scroll through the files it will show a preview, Zed doesn't show a preview until you actually select the file.

Sublime Text is not aligned with an 'any minute now' pivot to enshittification.

And whatever it does, it does better than Zed, debatably.

If you need to ask this question, that means there is no difference for you. Just choose one and commit.