For general purposes, which is the better brass between Remington and Winchester?

I like the 280 Rem and the 257 Wby but they both are limited on their brass selection so I have a few specific questions for those.

I believe the 280 only comes in nickel plated brass from Winchester. Is that superior/inferior to regular brass? Would it be better to stick with the Remington Brass?

For the 257 Wby, I would want to size down 7mm Rem brass for practice sessions to save $$. Will this cause any problems? For serious hunting purposes, should I stick with Norma/Weatherby brass for the 257? Is it worth the extra cost for the Norma brass worth it in terms of accuracy or number of reloadings to the extent that it would be feasible to use all the time?

Do a search on the subject here. The question comes up frequently and has been discussed in detail. Bottom line, it's a crap shoot and depends on the lot you draw. Everybody's opinion seems to differ but as I recall, Winchester is a slight favorite.

For practice loads, try most anything.
For high price hunts in poor weather use the plated brass. Is norma brass worth it, yes.
Sizing down one brass to get another is how most things have been done in the past, what is different today....we have more money to buy correct headstamped brass or ANY caliber we choose.
Winchester used to be more consistent from lot to lot, but you can't always get allll the calibers you want in remington or winchester...so use either. Check for flash hole burrs, poorly formed case necks, and WEIGH ALL cases to cull out the light/heavy ones....case volume consistency is the key. Oh yes, resize new brass before you load...neck tension varies a lot if you don't. Just don't alter headspace. And be sure to square case mouths and camfer lightly.
just my nickel.

SP

Are there any drawbacks to the plated brass? Does it flake off?