the blazer brass since its $2 cheaper....
ive shot many of both, the first time i shot blazer brass i got bullets and cases that looked oxidized and not polished at all....
every other box ive shot has been nice, smooth and polished like the wwb.
they seem the same to me, in my random experience i "seem" more accurate with BB, thats just me. BB is cheaper, so thats what i shoot.