Re: brass or nickle preference....
Nickel is dissolved with Hoppe's #9, Which is a damned fine reason not to clean nickel plated firearms with the stuff.
My judgement about nickel plated brass is that it is superior for ammunition which will be subjected to long storage or extended handling prior to use. Mostly, the nickel plated neck interior may, I say may, be a way to avoid the bullet to case neck bond which alters projectile pull force, and can affect accuracy. Of all the factors I can think of, that one seems most important to me.
Projectile selection will probably also have additional criteria, with the potential for corrosion being more highly significant
I try to only load nickel cases for application where I do not envision multiple reloading cycles.
Greg