forget about the spherical map discussion for right now, and the rammifications it has upon your decision, i'd like a purely aesthetic answer here
also, don't stand on your soapbox about a tileless system. now is not the time.
which do you find more visually pleasing for tiles? squares? hexagons? octagons? other?
you can assume they'll be isometric (ie, a square in civ2/3) to enable a fake 3d effect.

which do you find more visually pleasing for tiles? squares? hexagons? octagons? other?
you can assume they'll be isometric (ie, a square in civ2/3) to enable a fake 3d effect.
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