I reload with cast lead projectiles and won't use nickel plated for cast round reloading as I flare the pistol case mouths more to easily accept the softer cast lead rounds without shaving any lead off the round. Flaring and crimping the nickel plated rounds is slightly harder on both the dies and the case, so I don't do it. But for FMJ projectiles that don't need additional case mouth flaring, I'll use whatever shells are next in the hopper, so to speak.
Another point - I swage less favorable 9mm brass into .40 S&W JHP rounds which requires annealing of the shell - and that is only done with brass - can't be done with nickel plated -
I find the 9mm nickel plated shells make nice bullet necklace pendants - I'm sure someone will cringe at that comment ;-)
Nickel plated shells are " pretty " and they do hold up longer in storage as they won't tarnish- but then if you are storing your ammo correctly, this shouldn't ever be a problem.
At the end of the day, for responsible & learned shooters & reloaders, nickel plated brass seems a fashion statement more than anything. I have more reason, being a caster, to avoid nickel plated shells and no reason to seek them out or favor them.