Give us the name of the CPU we can easily help you than..
Just put in the links of the CPU's and we can point out this one..
In terms of better :-
Core 2 Quad
Core 2 Duo
Or you can ask to recommend a CPU for a money limit and what use you plan getting out of it
A "spec" is not better then "series"
a dual core is not better then a core 2 duo IT IS A DUAL CORE how can it be better?