Dual Core VS Dual Processor

Which one is better?(ignoring costs)
I'm thinking of making a dual core system, but woundering if one is better then the other, and how so.

Dual Core is better for multithreaded applications, since they are likely to be accessing the same data at approximately the same time, so there are fewer cache misses.  Dual CPUs is better for multiple single threaded applications, because each chip has it's own L2 cache, and since each program is working in its own memory space, there will be fewer cache misses.

Actually, nevermind, My logic is retarded.  Dual Core is better.