Maybe take both for a brief spin, but my vote would be for svelte. I used vue2 about the same timeframe as you (stumbled upon it while trying to find alternatives to React or whatever) and really liked it a lot.

About a year ago I had to tackle a few new web projects so I decided to give React/Angular/etc another look... and promptly went hunting for alternatives again, and that's how I found svelte. We've got 5-6 svelte-based projects in production now and have really, really enjoyed it.

All that said, I haven't looked at vue3 in depth yet, so maybe it's amazing, I dunno. :)