Both are very good brands,I`ve heard there are problems with IBM 75GXP range with AMD Athlons(not sure about Intel systems) faster then 733mhz using ATA-100,I believe there is a patch out for when running ATA-100 speed on Athlon based sytems,but apart from this go with either,I would say IBM as the edge just, but it`s a personal thing.
🙂