For my main, I switched from BRD to DNC - although, I still plan to flex both. DNC being more support oriented is what prompted me to switch, as well as its aesthetic (still attached to BRD though, which would be expected after 3+ years of playing it).

For my healers, I switched from AST to WHM because AST is just terrible right now. Terrible potencies and terrible design. They took the old card system that initially drew me to the class and destroyed it. And it feels like I'm healing with a broken weapon compared to WHM and SCH.