>>15953804
I personally replay them all in release order on a 6 months - yearly basis since 2010. Naturally, I'm heavily biased towards the idea of not letting any of the games behind and replay them all, despite the really "shitty" cases you may face. (2-1, 2-3, 3-3, 4-3…)
In my opinion, the very first game (even without 1-5) is the most solid one among them all, closely followed by Ace Attorney Investigations 2.