I don’t mean to come across as an ass but you need to be honest about yourself.
If you can only pick one of each then definitely go with ammo as that seems to be a good all around. I gave that to a friend of mine who is about 28 and he really likes how it affects him and others around him. He is Filipino and probably doesn’t have a high none profile.
You can’t go wrong with IS or IO but based on your welcome post you seem to indicate that you are looking more for an icebreaker. IO would be a good choice.