Federal - just look at their packaging.
I just bought 5000 primers, but the company I bought them from mistakingly gave me Federal's instead of the CCI's I ordered. I was able to exchange them though and the difference is REALLY pronounced. The box of Federal primers was shipped with 3 times as much packaging as the box of CCI's.
Be warned, Lee doesn't recommend using Federal's with their Pro 1000 progressive press. There's quite a few threads with pictures showing why: exploding presses with chain detonations. Ouch!