Which is better?

This is a very general question. The Athlon 64 Dual-Core 6400+ Desktop processor beats the Pentium T4500 notebook processor.

I would refer you to the below website to compare the general processing power of central processing units.

http://www.cpubenchmark.net/
 
I have experience with using Athlon 64 X2, it helps to increase the performance of the desktop and durable to use.
 
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