I would like the former because it is definitely more powerful.Personally, I'm going for the latter. One thing that I hated in IV was having to start a game and switch to the editor before creating the map. Of there is an edit mode in game, that would be fine. But of one wants to create a map from scratch, there should be an external editor.
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To me, it's also more convenient, but if they make an external editor where you can runa map script and regenerate it, it could be ok. The way it was one in V ment that testing a map script in game took easily three times as much time as it did in IV because you constantely had to run different programs. I'm not talking about a one-time at start, but of hours lost because map script testing requires a lot of time.
The real drawback of external editor is you can't change the terrain during the game. My daughter did that a lot. Basically, it is impossible to play the game she did with Civ V's external editor (namely: put peaks around various civs at start, let everyone grow, and then take them down).