I don't use either framework, but for whatever reason I find the Mithril example markedly easier to read. This is simply a matter of taste.
Both of those snippets are intended to generate HTML. In that sense there's no question which one is easier to reason about/read.
I would argue the opposite — it is immediately easier to reason about, since I see what functions are called, and I can go look up the documentations for those functions without having to go through a precompile-step.