Marko is faster and lighter. Also the syntax of single file components is more minimalistic than Vue, which is a good thing.

I'd say there is no interest because the single file components are quite new, and before that the project was focused on being a really fast templating engine.

https://github.com/marko-js/templating-benchmarks

Check this presentation about Marko, I found it illuminating.

https://www.youtube.com/watch?v=i6eZA8Y_GgA