Fallout – Will wearing special outfits during smile time affect a child

The highest average stat between the two parents determines what the child's highest stat will be. However, it only decides what the highest stat will be, not the value of that stat.

I have good experience in sending out a dweller with high S and high E stats. An outfit which pushes those values further or an outfit which will add A/L would help too.

As I noticed in my own game, people with a higher L stat often come back with more corks and more/better items. S and E will help your dweller to fight against bigger enemies.

And yes, as you already stated... a very big gun would be beneficial. ;-) But if your dweller find a better thing on it's own - he will always equip it itself.

Another good thing are stimpacks and rad-away. I often gave them many on the road. This way they can survive for many hours. The longer the exploration - the better the loot.

I hope this helps you. :-)