Nice find !
which do I prefer ? Yes.
Ok, the bathyscaphe hasn't left my wrist since I got it- I like the minimalist, sparse look of the dial, with the great sunburst effectl and the grey ceramic case with it's angular facets and deep graining.
I don't think pics do it justice, it always looks either too flat and dark or else it's under a spotlight and it looks overly glossy and a bit cheap. In real life IMHO, it looks pretty much perfect.
All that said, if I could keep only one, it would be the Titanium/blue dialed 5015, for almost all the same reasons above, beautiful dial, facetted, satin brushed case, plus that gorgeous lumed sapphire bezel.....
and I can get away with wearing the full 45mm....