Discussing the values of hexagon and square grid game board
After some discussion we have concluded that the hexagon map works better, as there are no issues with diagonal movement distance, which you get from using a square grid. Hexagon shapes allow equal-distance movement between tiles, where a square grid allows diagonal movement.
The conflict I have is that squares work better for cities and buildings games and hexagons work better for movement games. As our game is a mixture of both, it makes it an interesting choice. There is a limitation with using hexagons, as you sacrifice either true horizontal or vertical movement. Hexagons will always exclude moving in a straight line for north-south or east-west directions.
As a result of this discussion I have made up a new grid over a map of Europe with hexagons encompassing the United Kingdom to West Russia, and down to Algeria. I think this will work better for moving troops, and should have far less effect on cities. The map takes a total of six A3’s, and is roughly the same size as the previous game board.