Feature(PICKit2 Programmer):
PICKIT2 is a cheap development tool for PIC. Although it supports less ICs than KIT3\ICD2, it is much better than K149 150, and its stability is better than ICD2. It can also be batch-programmed offline.
KIT2 is a good choice for beginners.
ICs supported by PICKIT2 can be viewed with the MPLAB IDE software.
Open the software, configure->select device PICKIT2 is supported by the green light.

Feature(PICkit3 Programmer):
PICkit3 is a development tool that can simulate and download PIC online.
PICkit3 is Microchips development tool for online simulation and download designed for beginners to learn, evaluate and develop PIC series MCUs.
PIC Series Microcontrollers Connect to PICkit3 via ICSP Interface
Supported Software: Direct support for Microchips official IDE (Integrated Development Environment Software) MPLAB
Supported devices: Supports all PIC series microcontrollers with ICSP interface
For PICKIT3 supported ICs, you can view them through MPLAB IDE v8.92
Open the software, configure->select device PICKIT3 is supported by the green light.

Specification(Programming Adapter):
The seat supports the following programming microcontroller:
PIC16/18XX 40PIN Series devices (except 16F59)
PIC16/18XX 28PIN Series devices (except 16F57)
PIC16/18XX 18PIN Series devices
The PIC 8PIN/14PIN/20PIN family of devices (except 10FXX)

Specification(PICKit3 Programmer):
Programming function: can burn FLASH ROM, EEPROM, etc.
Simulation function: support various debugging methods such as full speed operation, single step debugging, breakpoint debugging, etc.
Simulation performance: using USB interface for simulation