Definitely TBS - mainly because I don't think the RTS system would be workable unless the game was dramatically simplified.
In the more recent TW games, the scale is simply too large and complex for an RTS setting to work correctly. The player would either have to eternally pause to get an overview of his situation, which would completely destroy the objective, or would have to try to watch army movement, his own defence and his economy at the same time, probably resulting in a rather frustrated person at the end of it all. This effect would be amplified if the player had extensive borders.
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