If you have no previous experience on cars, mechanical failures and how to get things sorted out you may benefit from buying a brand new as it is covered by agents warranty. But, there is no argument that it is behind the used jap in all other aspects (except FE).
Please be aware that most 110s, FB15 are hacked by now. It is very difficult to find a well maintained one with recorded history and true milage. So when things go wrong you could be taken for a ride by the mechanics if you have no knowledge in the subject.