They are differen brand of uControllers.......... some people favor one more than the other one. I have been wanting to try out the AVR's but since I have everything I need to program the PIC I have been lazy to leave this comfort zone I have created. :lol:
Here I attached to documents that compare them. ATMEL created on and of course you are going to find the article somewhat biased to the AVRs :wink: Microchip created a counter-act document..... you try them and probably have to decided
Good Luck,
Ivancho