The processor defines not only the output of a computer but also the memory type and the price of the whole notebook. Keep in mind that there is no one best notebook processor for all tasks!
When choosing a laptop configuration is not to chase top megahertz processor. Mobile processors significantly more expensive than desktop processors, but with the growth of this difference is the clock frequency is increased even more. Buy processor with three or four steps below the highest frequency available for this model - processor`s output is more than enough for any modern application, and you will save a significant amount of money.
Today there are only two companies on the market to produce processors: Intel and AMD. Processors used in laptops, different from those set forth in desktop computers. AMD like Intel have processors, specially designed for mobile computers. These processors differ introduction of technology to reduce energy consumption.
Currently, Intel took a leadership on mobile processor market. Most laptops using Intel processors. The main advantage is Intel SpeedStep technology, which allows to reduce power consumption by reducing the clock frequency with minimal downtime or load.
Dual processors are now available for notebooks too. To replace Intel Centrino is a new version of processors for laptops - Intel Core Duo. I would recommend Core 2 Duo at that time if you plan to use a laptop as an alternative to a desktop system want to launch some modern games on your notebook from time to time, the most optimal choice for you then will be a model based upon double core processor and is preferable to select a high-performance model processor Intel Core 2 Duo, Intel Core Duo, Intel Pentium T, AMD Turion.
In all other cases (for the office business applications) Intel Celeron and AMD Sempron models are still enough.
if you want buy a laptop it depends your needs.. but to date the leader in mobile is intel - then go for intel beacuse of this reasons; (The main advantage is Intel SpeedStep technology, which allows to reduce power consumption by reducing the clock frequency with minimal downtime or load.)
hope it could help you... :)