The Nano board can be powered via a USB C connection; 6-12 V unregulated external power supply or 5 V regulated external power supply ^^ the Nano V3 development board is the smallest, complete and breadboard-friendly board with more analog input pins and onboard +5V AREF jumpers. ^^ The Nano board has 14 digital I/O pins (6 of which can be used as PWM outputs), 6 analogue inputs, a 16MHz quartz oscillator, a USB C power socket, an ICSP port and a reset button. ^^ Uses the CH340G instead of the FTDI FT232RL IC which can improve the transfer speed, increase the stability in windows and solve the issues with FTDI drivers bricking non-original chips, ATMEGA328P offers even more programming and data memory space.
It also has a pin layout that works well with the Mini or the Basic Stamp (TX, RX, ATN, GND on one side, power, and ground on the other).