When deciding between MPIDE and the Arduino IDE, the short answer is simple: You should choose the official Arduino IDE. MPIDE (Multi-Platform Integrated Development Environment) is entirely obsolete, deprecated, and has been defunct for years.
The entire codebase and functionality of MPIDE were consolidated directly into the official Arduino IDE via the chipKIT Core plugin. Unless you are supporting a legacy system built prior to 2015, using standalone MPIDE offers no modern utility. Key Takeaways
MPIDE is dead: Development officially ceased in August 2015.
The solution: If you are using 32-bit Microchip PIC32 boards (like the chipKIT Uno32 or uC32), you should use the standard Arduino IDE and simply install the chipKIT Core package via the built-in Boards Manager.
Modern Alternative: For those outgrowing the standard Arduino environment, Visual Studio Code paired with the PlatformIO extension serves as the leading modern upgrade path. Feature Comparison Arduino IDE and Chipkit Network Libs? – Digilent Forum
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