The current growth of the Arduino platform is fueled by the many new boards that make it easier to squeeze Atmega processors and their associated peripherals into ever smaller spaces or unusual places such as clothing.
Neather hoarding or fetishism explain my large and growing collection of Arduinos (official and unofficial) - I use them to test the sketches and libraries that I share and to teach people how to pick the best one for their applications in
my Arduino Workshops.
For most of my own work on musical instrument controllers I gravitate towards the Teensy family. I use the relatively compact Seeeduino mega when I really need a lot of pins.
