Would like info on best brass to use for 6.5-284 hornady, lapua. norma or form from winc.?

I use Hornady with good success.

we - They are all good, however, most all the competition guys only shoot Lapua brass. It requires less work and the brass is more dimensionally uniform from case to case than any other. This cuts down on your case prep work. In fact, I do not believe that I have ever culled a Lapua case before and I generally cull up to 10% on Winchester brass, and even more for Remington. In my mind, this cost justifies paying more for Lapua quality.

The only negative I have heard about the manufacturers you listed was with Norma brass. They had (or have) a problem with uniform primer pockets in their 6.5-284 brass.