A ARM 32bit micro with 72 MHz clock is speeder than a 8 bits micro with 16 MHz clock.
There are more I2C, SPI, Serial,
There is a CAN bus.
There are much analog inputs with best acuracy
There are more of all because it is a more recent micro.
But for me main advantage is 50 % Inputs are 5V tolerant.
I don't known other ARM micro with this capability and no arduino ARM-Atmel board (DUE,Zero,MKR) can do that.