PIC (usually pronounced as “pick”) is a family of microcontrollers made by Microchip Technology, derived from the PIC1650 originally developed by General Instrument’s Microelectronics Division. The name PIC initially referred to Peripheral Interface Controller, and is currently expanded as Programmable Intelligent Computer.
Please follow this link for further information on the family of PIC you require if not here. https://www.microchip.com
ATtiny (also known as TinyAVR)
Are a subfamily of the popular 8-bit AVR microcontrollers, which typically has fewer features, fewer I/O pins, and less memory than other AVR series chips. The first members of this family were released in 1999 by Atmel (later acquired by Microchip Technology in 2016).
1999: ATtiny11, ATtiny11L, ATtiny12, ATtiny12L, ATtiny12V, ATtiny22, ATtiny22L
2002: ATtiny15L, ATtiny26, ATtiny26L, ATtiny28L, ATtiny28V
2003: ATtiny13, ATtiny13V, ATtiny2313, ATtiny2313V, ATtiny4313
Please follow the link here if you do not see the ATtiny of your choice here. https://www.microchip.com