* Power consumption
* Maybe your overall budget is less that $10 for everything
* Size: one project I'm working on has a 1.5x2.0" space available for electronics
* Start time. Maybe you need to get in control within 50mS of power on before that actuator starts flailing wildly around.
* Control over the entire stack. You can't always trust the code running underneath you.
I could go on, but you get the gist...
* More IO options
* Arduino libraries (there is a easy to use lib for every component/sensor/...)
* Power consumption
* Maybe your overall budget is less that $10 for everything
* Size: one project I'm working on has a 1.5x2.0" space available for electronics
* Start time. Maybe you need to get in control within 50mS of power on before that actuator starts flailing wildly around.
* Control over the entire stack. You can't always trust the code running underneath you.
I could go on, but you get the gist...