I'd choose the Rolex. They're oyster case fits me better and is a more appropriate & comfortable size for me.
I'd go Rolex as well. Though it wasn't love at first sight, the blue/black bezel has been steadily growing on me, and I do like the 40mm case.
Rolex I would walk a bit further up to the Zenith AD for a bit of a change, at that amount of $ and your collection. (No spanner so wink)
Rolex. No doubt. Love the BLNR ceramic bezel. Stunning watch. No sleight to the Speedmaster, but I prefer the Blue & Black 'pop'