As far as we yet know each Ideology bind to at least two possible way of winning the game. So for me it would be interesting to try and to win all victory types that are dedicated for certain Ideologies. It would be interesting to do a culture/political victory, while taking Order, or science/political victory while taking Autocracy. Moreover, if it will appear that tenants are really well balanced I will try to choose which leader to play depending on what type of victory I'm going to play and on what Ideology.
It would be really cool to have as many like to say "Communist" Napoleon, for example, or Autocratic Hiawatha (you got my point).
Going little on personal, I think I'ml not really look forward to take Freedom in a first place because:
1. I consider it's rather obvious thus dull;
2. It may appear less challenging;
3. However, if there will be not obvious but yet reasonably achievable victory conditions choosing Freedom ideology tree I will gladly try them with flavor!
Most certainly I'll end up choosing what Ideology is most suitable in given circumstances. So finally nothing is solid...