arranger every time !!! i see no genuine reason to buy any other keyboard instrument for worship.
To accompany a soloist you can use the arranger in piano/electric piano mode or even substitute the piano for an accoustic guitar played through the keyboard ! Or become the string section with cellos, violins and horns trigured by velocity switching.
For traditional worship you have just about every type of organ in the preset sounds of the instrument.
For contemporary worship you can get into some very energetic and lively praise worship and dance just by using the drum and bass elements of the arranger .
For group worship with other musicians you can play the instrument just as a stand alone keyboard or fill in the essential parts that might be missing say , you dont have a drummer , organist, brass section bass player , strings section etc
In group worship when there are no other musicians you can still get the full sound of a live band and can trim that down to just drum, bass, and keys and retain that intimate sound without a full orchestrated arrangement
For small venues and small groups who might worship from house to house or hire a room in a local school ( i know many who worship like this ) what could be better than an arranger ?????
And in the work that i do as a writer and arranger for my local church youth choir , remixing songs and injecting new enthusiasm and energy by simply trying out new styles is just something that has to be experienced to believe. i simply could not do what i do with any other type of instrument !!!!
I would never buy any other form of keyboard instrument ever.