VERSUS: Comparison of the IIs; GMT and Explorer

Eighteenth edition of the "VERSUS" post/picture. What is "VERSUS"? Well, I thought it would be fun to compare two watches (and only those two watches) and discuss pros/cons by outlining the differences and getting folks' ideas/thoughts/opinions on TRF. We got folks here that have been collecting and studying these things for decades and those who are just starting to venture into the crazy world of Rolex (and everyone in between). Therefore, it would be fun and educational!

For this edition, we have a couple sport model "IIs"; the GMT Master II and Explorer II. GMT is reference 16710 and Explorer is 16570.

Which do you prefer and why?