I'm just being silly. I have an MSc and my wife has a MA, so I promise there's no ill will - they absolutely are as good as each other. (Honestly, if anything I think she wins out, as she had to write her dissertation by hand - mine was all on computer).
In the same vein, an MD is just as much a doctoral degree as a PhD - it's just in a different area.
In some places PhDs were treated to be higher diploma than an MD though, at least in Hungary there was - many years ago - some odd system where you could only capitalize "Dr." before your name if you had a PhD, if you were "just" an MD or a legal doctor, you could only have it like "dr.".