it doesnt matter
if you plan to overclock and might be overvolting ram quite a bit then maybe corsair would be better choice, the heatspreader has to do some thermal transfer i would assume lol
i think all pc3200 chips are samsung chips, just picked and used on any other company pcb (corsair, etc)
if you dont plan on overclocking, it doesnt matter which one you get
pc3200 isnt JEDEC "approved", so maybe thats why its not being widely used by some companies