I never had Corsair but crucial is just micron = one of largest memory manufacture.. I only use crucial (Registered ECC) for work and regular for home and they been great. Has some OC ability in it but I don't think as good as Corsair.
1 thing is, I order a PC133 in feb and the same part in april. The one is feb was double sided and the one in april was single sided so in effect the double side took two bank and the single took one. Even though they're the same part number, they're actually differnet..