Who makes the best is more a matter of opinion. I can say both of those mentioned are advertised to give 1.5" lift... i have heard of some people getting 2" out of the AC's but it probably just depends on leaf pack wear/sag.
I have the AC's; chose them because they are beefier with the crossbrace... for the extra 5-10 bucks I would go with AC. No powdercoat to worry about flaking either; just rattlecan them if they get scratched up.
Daystar and SLR have shackles available as well. Daystar are 1.5" lift and SLR are .75" lift.