Blazer = Low QC - I have personally had primers fall out of ammo and I have talked to two different people that experienced squibs with it. I also had a batch with other branded and mixed brass (although it all went pew just fine).
AE = Better QC, never had an issue and never heard of any issues with it.
Personally, I will gladly pay the extra $10 per 1000 rounds to avoid having a squib or my primers fall out of a round in the middle of an IPSC match.