With ebike conversion kits there appears to be 2 types of rear hub motors: the ones that accept a cassette and a freewheel (see the image below from this aliexpress item)
Is the freewheel option more serviceable?
I mean when I'll be replacing the freewheel I'll be replacing worn out sprockets together with the ratchet mechanism.
Whereas with the cassette option the ratchet mechanism comes with the motor and I'll be only replacing sprockets and if there's a need to replace the ratchet then I'll have to replace the whole motor or is the freehub part with the ratchet that the cassette attaches to also replaceable?
Or is the freehub on the image above just screws on top of the freewheel attachment threads?