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Is there a hobby group in your area? Which one do they use? That one will give you good local support.
Which one has the best distribution/prices in your area? Will one manufacturer send free samples to your area, but the other will not? That is another important point.
Depends on the application - power consumption, ease of use, availability, price, etc., but from my limited experience...
PIC (Microchip): Many configurations (probably the most), very popular, easy to program (35 instructions), lots of DIP-packaged chips which are easier to prototype, samples readily available, reasonably priced, good support. Easiest to use, but quite inefficent. Best where versatility and ease of use are most important.
AVR (Atmel): Not as many configurations, not quite as popular, also lots of DIP-packaged chips but not as many as PIC, faster and more efficient than PIC, more complex instruction set, samples available but somewhat harder to get, reasonably priced, good support. A good balance of complexity and ease of use. Best where efficiency and ease of use are equally important.
8051 (Intel): Industry standard, most popular, least amount of configurations, samples available from many companies but still not as easy as PIC to get, some DIP packaged chips, the most expensive, don't know about support, Fastest and most efficient, but also the most difficult to program (150+ instructions). Best where speed is of the essence and money is no object.
MPS430 (Texas Instruments): has the lowest power consumption (by a longshot!)
Your experience will likely differ. It is also largely a matter of personal preference. I personally like PICs. That may change as I transition from hobbiest to professional.
I think PICs are suitable for control electronic device but AVRs are suitable for processing (for example dsp or registerical process).In PICs pin controling is easy and in AVRs register controlling is easy .
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