I used a Specs Exploud early on in the meta, the thing is both of them play quite differently apart from boomburst. While Chatot can U-turn which is good for a choice set, apart from that, it's stabs and Heat Wave, it's movepool is limited, meaning it can pull off a better boosting set, but Exploud can do a better mixed set or even an all out attacking set with Scrappy. Due to Exploud's mono type, it can probably do AV sets better, tanking some hits while hitting decently hard, at this point either ability is preferred.
Chatot has other options, however. It can pull off a defensive set with Chatter and Roost, a pivot set with u-turn, reasonably decent choiced sets (but ultimately exploud is better in this except for voltturn teams), and a boosting set with NP. It goes down to your preferred playstyle, tbh.