I ticked 'other',
I normally use the ATTiny or ATMega micros as nature intended
(without the Arduino environment)
But it really depends on what you want to do.
- If i need more power i go to a STM ARM micro.
- If i wanted to make something for the hacker community i would use an Arduino.
- If i was mass producing something in quantity i might use a PIC. (They are often more specialized, so it's possible to pick one that only has the features you need and save some money)