Not sure if this was ever posted (it's pretty old), but it's a pretty solid comparison for newbies. We talk about this a lot, so here's a good reference video.
https://youtu.be/UGANVTsDKH4 Ita just marketing talk...
The pa4x is just as much workstation as arranger
- workstation is a concept..
- auto accompaniment is a feature
- arranger is any keyboard with auto accompaniment on board..
Its just a thin line..
In general its better to just compare features between keyboards
The labeling them in cattegories?