I think every breeder determines which pup goes where differently. I have had the breeder pick for me and it has always been the perfect puppy. I picked last time and she is the perfect puppy for me.
I got Lydi from a breeder than lets the buyer pick the pup based on order of reciept of the deposit. She assess the puppies and helps the buyer chose the pup best suited to them. The breeder is also my friend and training partner.
A litter just went home this past week and the first deposit was made by a repeat buyer from out of town that wanted a pup suitable for therapy work. There were 2 pups the breeder thought would fit that role, so the buyer was encouraged to pick from those two puppies. Another client was thrilled at that. As they live locally they were able to come out and visit the pups and they fell in love with one of the pups that would have made a good therapy dog. The first person chose the other pup and both buyers are happy as can be. Another buyer had third pick of the 3 remaining females. With breeders guidance she chose purple collar girl who was the quietest and most mellow of the pups. The buyer was a widowed lady in her 50's buying a GSD for the first time. She too is happy with how her choice worked out.
There is still one female pup left of the 5 females and 2 males. It turns out I think the female left is the nicest pup from the litter. Breeder thinks so too and is considering keeping her if the right home does not come along.
So last pick is sometimes best pic. And with all the pups and personalities of the pups I think it tends to work out the way it should work out.
I have had males and females and I have never thought I needed any extra info about raising a male. They may be a tad more territorial but even that has not really been my experience. I raise them the same as I have raised females..
URO3,UCD Aleshanee Windridge "Kayos" CD,TDX,RE,CGC,HIC,TC
PTE,AG2,AN,URO3,UCD Xtra!Xtra! V TeMar "Havoc" CDX,GN,RE,CGC,HIC,TC,BH
UACH,URO1 Tidmores Rising Star Lydia "Mayhem" CD,BN,AX,OAJ,NF,RE,HT,TC,CGC,
Lucky, Wolf, Max