So I guess it doesn't matter which units I use then? They're all good and none are better than the other?
None of them are really terrible if that's what you are asking, but yes you can pair your male/females together which will unlock extra maps where you can get there child after chapter 13 and they all have much higher base stats and have some of there parents skills.
''A baby isen't like a golem, i can't make it all by myself !'' - Elena
Well while I have ya, do you mind giving me quick explanation of what this marriage thing is all about? Is it just like it is in FE4? Can anyone pair with anyone or can you point me to a list of some sort? How long does it take to get them married?