Why change? Is it broken? Is the Mbox not compatible w/W10, w/PT2019?
There are lots and lots of options out there, in the 2out/2in category, all with many small differences like: connection type, extra connections, controls, control software and so on. Some compatible with your computer/software, some not. I doubt very much that you will get anything like a comprehensive answer here, that takes everything into account. Especially as we don't know the details of your hardware or prefered workflow.
I really think there is no way around it; you'll have to do the leg-work yourself, searching the web for info.
I wish you good luck.
Edit: I found the thread where you just posted about the Mbox 3 not working:
For heaven's sake, will you update the drivers for MBOX 3 please, Avid?
I still think you'll have to do it yourself.