PWM pins work the same way across all Arduino boards, so you don't need to go out of your way to buy a Mega if you already have a board supporting PWM. On the Uno, Nano, and Mini, the PWM pins are ...

The Metro board is also equipped with 19 GPIO pins, 6 of which are Analog and 2 of which are reserved for the USB-serial converter. There’s also 6 PWMs available on 3 timers offering 1 x 16-bit ...