Compare Intel Galileo and Intel Edison

I am quite new to the Internet of Things. I checked the Intel website and went through a few other links too. But I cannot clearly understand what is the difference between Intel Galileo and Intel Edison? And which one should be used when?

Does anyone know of a good resource for reference?

I will list key features of both

Galileo

• CPU: Intel Quark X1000 400 MHz
• RAM: 256 MB
• Storage: Micro SD Card

Edison

• CPU: A dual core, dual threaded Intel ATOM x86 CPU running at 500 MHz and a 32-bit Intel Quark Micro-controller running at 100 MHz.
• RAM: 1 GB
• Storage: 4 GB ROM + (micro SD card on Arduino board)
• Communication: Wi-Fi and Bluetooth LE.

Summary

• Edison is way more powerful in terms of CPU (ATOM vs Quark) and RAM.
• Edison is more flexible like while making prototype you can use it with Arduino board and while deploying you can use it with smaller breakout board required for your application.
• Almost all things that can be done using Galileo can be done better using Edison in very smaller form factor (correct me if i am wrong).

Conclusion

Difference between Galileo and Edison is 1 year of more research and technological advances by Intel.