I enjoy open maps , you can get an overview of what is happening. Ofc very handy when releasing arrows
Hate the crowded citymaps and dense forrest. Can never tell friend from foe before it is to late.
Open maps need unique objects you can refer to.
The wooden bridge, the stone bridge, farmhouse.
Or if used properly just common things ..like the BIG tree, pond,cave entrance ... etc..
I would avoid making two large opposing hills in bowrange .. it only leads to camping and the epic shieldwall...
With some creative use of elevation and brushcover in the terrain, infantry should stand a better chance versus cav and ranged.
Make it possibly to move tactically, staying out of line of sight from enemy main force.(without putting up impassable tall walls.)
Usually its just totaly flat.. with slight elevations.
Oh and funnels are nice.. so that the two groups meet, and do not run around in circles, but that is maybe more a crpgplayermentality thing ..not maprelated.