I don't have need for a personal db, but I would likely choose MySQL since I know how to set up group replication, multiple writers, delayed replication, etc an

I don't have need for a personal db, but I would likely choose MySQL since I know how to set up group replication, multiple writers, delayed replication, etc and none of it requires extra software or is particularly difficult--follow the instructions or RTM. It also runs pretty well on smallish machine instances.