Total War: Rome, 3k, or Attila? Which should I buy next?

I already have Shogun 2:TW & FoTS. I also have M2:TW in mobile + dlcs (i don't vibe with getting a copy of the same game when I already have it on another platform).

So far from my research, my understanding is this:

Rome - Solid overall, balanced diplomacy and combat. Also you get to vibe in roman era. I have tried Rome 1 in mobile (albeit I hate the controls) but so far sounds fun!

3K - I swear my memory told me this had a low rating. But upon checking this game again, it is praised to have fun campaign experience, especially being hailed as "the best diplomacy among the TW titles." I am most intrigued especially on this as so many times I wish to take a breather with my investment on diplomacy as compared to Shogun 2 and M2TW (never trust Milan).

Attila - I don't know much on Attila, all I remember is seeing LegendofTotalWar gameplay doing an impossible siege with an immortal general (forgot his name). Also looks neat to hear of it's campaign experience to be diverse to other titles of "just go hurr hurr conquer everything" especially with me enjoying siege battles. What's pulling me back is I hear the game has some issues when running it and also less content than other titles.