Imagine a binary planet - that is, two earthlike habitable planets in mutual tidal lock, like the ones described in this excellent post.

Now, these two planets are populated by humans and human-like species sharing similar level of technology, ranging over time (the story span is about 100 years) from WW2-like tech through Apollo/Cold War rockets to near-future innovations (like SpaceX's ITS). I mean, both planets start from roughly the same (WW2-like) level of development (due to Precursors or just Alien Space Bats) and then progress on their own, but sharing interest in each other - so there is some technological/cultural convergence as well as notable differences (like USA and USSR).

The important thing is, that some of the countries of the planet A may be hostile towards some countries of the planet B - and vice versa. I imagine that hostilities may range from jamming radio signals (as well as broadcasting propaganda and hacking when computers are invented) to launching Interplanetery (non-)Ballistic Missiles (what other hostilities are realistically possible?).

Now my question is: given all that information (including the planetary setup described in the linked answer), what are the advantages/disadvantages of possible locations for a country, regarding the potential benefits of knowledge exchange and risks of hostilities? These "possible locations" mean primarily near/far side of a planet (and perhaps the border zone of these two).

I imagine that near side offers better opportunities for interplanetary communication and knowledge sharing (just point your antenna skyward), but at the same time is easy target for interplanetary missiles - or am I wrong? Maybe bombing the far side is not so difficult after all?