Rome. None have ever surpassed it, none will. Rome 2 will never be as good as the original; look at Shogun 2 v Shogun.
Ntw all the way good time period and modding capability
ETW I think
Best Experience-I would have to say ETW i.e. ship battles, new gameplay etc, Do I still play it?? hell no.
Best Re-playability-I would without no hesitation it would be RTW, simply the vast amount of mods and its was just and is awe-inspiring.
Best time period-RTW hands down.
Best choice of native campaigns-M2TW kingdom Expansion
Most excited total war to have or look forward to-R2TW