Hi
Interesting question except that, IMO, you can't say one is better.
I was born and raised in a non-christian family and found Christ on my own when I was 16 years old. What comes next will be my commitment to walk with Him until today...
My three daughters are born in a Christian family. They do not need to 'find' their salvation since it is on their table all the time. Is it better? I don't know (and probably don't think so) but I do work a little harder at home to ensure that they do not take for granted what they have (I mean their salvation).