I have been to many, many more MK concerts than I have Springsteen concerts but I would also suggest that, in the wider world and in the longer term, Springsteen will be the one judged to have made the greater impact.
Though of a very similar age, Springsteen has had the longer career in the music business. Mark's initial success came with Dire Straits, a name that is possibly more prominent in the public conciousness than his own name; Springsteen has been through several "career iterations", as it were, but the Springsteen name has always been to the fore. I could go on.
It is neither here nor there what you or I think of the relative merits, qualities, skills and/or abilities of the two of them. An objective outsider, IMHO, would judge Springsteen's impact to have been, and to be, the greater.