Pi 4:
- Has more powerful CPU
- Has better GPU with support for newer OpenGL
- Has high speed Ethernet, Bluetooth, and WiFi
- Has 2 high speed USB ports
- Uses USB-C power plug (and has much higher power consumption)
- Runs at higher temperature
- Can have much more RAM
- Has 2 4kp30 micro-HDMI outputs
- Is harder, better, faster, and stronger