The second one looks better. The lugs are crisp, while the first one looks polished. Not sure why, but now I prefer unpolished watches and the case on my 16600 will remain untouched when service time comes. Also the second one has the drilled lugs, some people prefer those.

I think for £4,400 it's not a bad deal, the 16600 is pure classic, a legendary real tool watch, an evolution of the 1665 and was actually used by Comex.