I have only put WWB thru the M&P (approx 4,000 rds in 2007 alone) resulting in OUTSTANDING accuracy and reliability. I can't comment on the Blazer 9mm. I never had issues w/ Blazer aluminum casing stuff, but I have not used CCI Blazer Brass since the 2005 IDPA Carolina Cups (NC) where the .45 ACP ammo I was using in CDP was CRAP and kept causing FTFs. I attribute it to a bad lot and will never use Blazer in a sanctioned match again.
I've never shot any of the "Blazer Brass" branded ammo. My M&P9 has over 14,000 rounds of aluminum-cased Blazer through it, though, and I've got at least that much more in my ammo locker. You just can't beat it for the price.
I use lot of Blazer brass in 9, 40 and .45 and its fine for the range. I really don't think there is a significant difference between the two. I would buy whatever is cheaper which at Wally World is Blazer brass. Other cheaper brands I like are S&B and Magtech.
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