Trinket, Trinket Pro and DFRobot Beetle quick compare

              Trinket             Trinket Pro         DFRobot Beetle
-----------------------------------------------------------------------------------------
Chip        | ATtiny85            Atmega328P (Uno)    ATmega32u4 (Leonardo) 
SerialPort  | None                FTDI cable          USB Cable
Flash       | 8k                  32k                 32k
Ram         | 0.5k EEPROM 0.5k    2k                  2.5k EEPROM 1k
Clock Rate  | 16/8Mhz 5V/8Mhz 3V  16Mhz 5V/12Mhz 3V   16Mhz 5V
Amp         | 150mA               150mA               ???
Analog Pins | 1                   6                   5
Digital Pins| 5 (2 Shared USB)    18                  10
PMW Pins    | 2                   6                   4
Price       | $7                  $10                 $8

An FTDI cable is about $18.

Urls:

• Trinket Pro
• DFRobot Beetle
• Beetle (1Pc)
• Beetle SKU:DFR0282