The biggest pro of the AVR used to be speed, ...

And for the ATtiny26 not to forget:

10-bitADC (11 Single Ended Channels)
2 High Frequency PWM Outputs
On-Chip Analog Comparator
128 Bytes EEPROM
20pin package

And the price: Less than 1.75 Euro per chip (www.reichelt.de)!!

Kai