While Attila based on Rome 2, but is much better and more stable in every way and makes consistently much more fun. Above all, the diplomacy and politics system makes sense at a time correctly. The graphics are of course better, but that is rather trivial. The battlefield AI has improved considerably. The campaign AI also seems to me better. The game is a whole lot smoother.
Light Bugs there still and of course there are still some special quirks, to which one is accustomed than yes TW Player. The EoT times are optimized hopefully through patches.
Conclusion:
Between Attila and Rome 2 are in terms of quality worlds.
By Attila is a really realize how unfinished Rome 2 has always been.