the 2 watches are sporty watches that I would call opposite.
Polaris is a re-edition of a model of 1965 (or 68, depending) of a very innovative watch in its time. The calibre of the re-edition benefits from all the craftmanship of JLC and the look and feel is just like the vintage, IMHO.
I love it ( horomundians are tired to read me saying it in every polaris thread, I am sure).
the master diving geo is a very modern asymetrical yet very well balanced design. If I had to choose between the two, I would go for the polaris re-edition, no doubt. I am not a huge fan of the special keys locking the pushers on the master compressor serie, even if I like the technical wonder behind it.