Both the luxury MPVs are very capable and offer a lot to the buyer. If long-distance drives are something you may do, the Carnival with its diesel engine would be better. However, judging by your monthly running, it appears that you have smaller trips and perhaps within city/town limits.
The electric MG M9 would thus be fine. It has a better interior in terms of appointments and rear seat functionality, and given that you already have a liking for it, we would recommend you go with the MG. On a side note, the Carnival isn’t a CBU but is locally assembled.

