I've been looking at both these cartridges also and my opinion is... I want both
They are both close in performance and the 284 will slightly edge out the -06 in velocity, but will probably have a little shorter barrel life. If you go with the -06, you might want to go with the Lapua 30-06 brass and neck it down. It's a lot cheaper than the 6.5-06 A square brass. The Norma also has Lapua brass available.
Take your pick, you can't go wrong with either.