Help me decide on boys name

My husband and I have been struggling to come up with a name we can both agree on. I really like Irish names but he is not as sold on them. We are down to three choices for our son. Two are very similar and one is different. Help us decide

[name_m]Killian[/name_m] [name_u]Michael[/name_u]
[name_m]Declan[/name_m] [name_u]Michael[/name_u]
[name_m]Magnus[/name_m] [name_m]Asher[/name_m]

[name_m]Declan[/name_m] is my favorite, by far.