I would prefer AMD than Intel, not because it is better or worse, but because AMD is the second in the rank. Theses days big companies swallow small companies. We have only two competitors for CPU processors in the market.
The Apple–Intel transition was the process of changing the CPU of Macintosh computers from PowerPC processors to Intel x86 processors.
Reasons
Steve Jobs stated that Apple's primary motivation for the transition was their disappointment with the progress of IBM's development of PowerPC technology, and their greater faith in Intel to meet Apple's needs. In particular, he cited the performance per watt (that is, the speed per unit of electrical power) projections in the roadmap provided by Intel. This is an especially important consideration in laptop design, which affects the hours of use per battery charge.
In June 2003, Jobs had introduced Macs based on the PowerPC G5 processor and promised that within a year the clock speed of the part would be up to 3 GHz. Two years later, 3 GHz G5s were still not available, and rumors continued that IBM's low yields on the POWER4-derived chip were to blame. Further, the heat produced by the chip proved an obstacle to deploying it in a laptop computer, which had become the fastest growing segment of the personal computer industry.
Some observers were surprised that Apple had not made a deal with AMD, which has in recent years become a strong competitor to Intel, always introducing technologies more quickly than the traditional industry leader. AMD had recently released its competitive 64-bit Opteron platform,[8][9], and by moving straight to x86 64 Apple would have had one less architecture transition. However, Apple's decision may have been made in part based on power consumption and battery life concerns[citation needed].
from wikipedia:
http://en.wikipedia.org/wiki/Apple%E2%80%93Intel_transition
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