If you want a Total War experience (huge battles and shit) go for Radious.
If you want a Realistic Experience (elite units cap, reworked battle pace) go for Artis.
If you're lazy go for the All in One mod by Toons total war.
Here it is guys!! the best of the best all combined into one big mod, so no more having 10 million mods in your data folder, just one nice big juicy mod with all the best mods from the great modders out there! I will also be adding my own personal mods as time goes on and any updates from the modders to the list below.