My opinion - random map is the best map
I see that in general GT comunity has quite high facination with premade maps and scenarios. Somehow this is weird to me. I like fresh starts and emergence, with emergent conditions and setting. Though some minor twists are interesting, but something like WW scenarios are quite alien to me.
Now battling AI might not be that bad, though. Maybe something "civil war against empire" "scenario"/setting, (though starting with tons of techs also is not my thing), we would have one very large bot, having most of the land, and humans starting with one two cities or settlers in remote places/periphery of said empire. So that while humans will need to fight each other they will also need to take on empire together or be crushed by it. There are flaws with this of course, ai must be made tottaly human unfriendly (though I do not think anything needs to change, as in general bots are quite hard to befriend), and ai can be a bit dim thus not pose enough of a threat. OTOH ais love military units and sending waves of them.