I think the point that the UI of the default tools is better in Mercurial is entirely uncontroversial. However, equating that to the user experience is short-s

I think the point that the UI of the default tools is better in Mercurial is entirely uncontroversial. However, equating that to the user experience is short-sighted. The user experience is also how well the tool works and fills the needs of the user. It think it's very controversial to state hg is better there (this is a polite way to say you're completely wrong).