I don’t mind repeating a scenario if it produced a good game the previos time it was used.
Whoever lost last time is likely to try something different. A different player is unlikely to follow the same course of action anyway. So even if the previous winner tries to repeat what they did, they’ll find they are facing something new. If it looks like one side can’t win, that is an excuse to tweak the forces or the terrain or the scenario conditions. Enough such tweaks, and you have a whole new scenario to play.