Exetools - [Q] Reversing through OS emulation

Morning all, recently I have been evaluating reversing through the use of OS emulation. I was wondering if anyone had any reference, documentation, or experiences they were willing to share. Currently found two products:

PANDA which is an open-source github project
hxxps://github.com/moyix/panda/
REVEN which is a commercial product
hxxp://www.tetrane.com/en/products.html

But before I began investing too much time into learning and evaluating them I was hoping someone else may have traveled this road before me. Or if there are any other tools or platforms that would be valuable for me to look into.

Thank you and though I may often be silent here, I am so happy to still see the names of many good friends. :)