UltraStudio Express vs UltraStudio Mini Monitor

I am choosing between the two for my home studio. I am only looking for the monitoring option; not capturing video. Yes, I probably only "need" the mini monitor, but if the Express is more stable/faster, then I'd rather pay more for the higher quality. Also, do the extra features on the Express slow down the CPU?
Thanks!

If you only want it for output then I'd probably go with the Mini Monitor, both will be as stable as each other, and they both do the same resolutions and frame rates, in fact the Mini monitor is supposed to do 8 channel audio out whereas the Ultrastudio Express only does 2 channel.

As they both do the same with regards to output there should be no difference to CPU usage