I have a dual core. It is performing well for me. . . .

All,

Is a higher rate single core processor(1.4GHz) better than a lower rate(1.2GHz) dual core ??
Whats the difference? Is it only load sharing and power consumption?
If single core consumes 100% of CPU and dual core consumes 50% of CPUs each, is it not the same power consumed. Except that performance would be improved.

What are the advantages and disadvantages of both?

Which one is better among Samsung galaxy S2 or S Plus. I wont be running much of Games etc, but normal browsing, fb, twitter, etc.

Thanks
Kumar