1.)
4.) Personal preference.
For me MTW. It lacks the throne room and ingame videos as well as balanced units equal for all factions.
But therefore it offers loyalty for all units and Civil Wars (I missed them in all following games
). And character traits called "vices and virtues" for all units. Not only for family members as in RTW but for all units! You can make any small captain a great and influental person in your empire by giving titles to your characters as well as naming governeurs for each province.
And in battles you have siege engines now (and closed doors in your castles
). Not to mention "Glorious Achievements" (scoring points for missions) as second win condition beside the usual conquer x provinces.