Differences between AVR & ARM

i'm electronics newbie.

i'm totally confused. using google i've tried find out differences between avr architecture & arm architecture. google hasn't been help. know can 32-bit avr or 32-bit arm.

i want arduino there many different ones it's hard me choose one. went atmel website & looked around & didn't answer questions. arduino use avr? arduino have 32-bit atmel micro-controllers? arm used in likes of raspberry pi & beaglebone?

please explain in layman's terms differences between avr & arm.

i'm not sure use comparing cpu architecture going be. line blurred between these devices.
i.e arduino due arm board.

you'd better off letting know want achieve , people can direct appropriate microcontroller.

however in terms of raspberry pi, key difference rpi doesn't have lot of input / output capabilities. has few gpio lines 3.3v , can't drive current. interface rpi realworld hardware, people connect arduino based daughter board.

beagebone black bit different, has speed , ram of rpi, have hardware interfaces. far more expensive (i.e 4 or 5 times price).

if physical size issue you, there key differences between arduino class boards , rpi , bbb.
i.e can arduino micro board measures 32mm x 18mm virtually full arduino functionality, rpi , bbb around 10 times larger.


but, please post requirements.

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