I have spent the last few days looking at both the E63 and S65 and the S65 is just lush compared to the E63.
The lust is still there for the S65 BUT there is NO 2nd hand market for them and trade in will wipe me clean when the time comes to move it on.
Not saying there is a big market for moddified E63's either on which there is prob zero chance of recouping any money spent on mods. so I would say it's 6 and half a dozen.
Of the 2 cars the OP is considering I'd plump for the first one. The individual rear seat and fridge option on the 2nd one limits your resale market even further. The fridge eats into the boot space quite a bit and the bench seat is more desirable to owner drivers and chauffeurs alike.