I don't know how much detail you want to go into but here are a few things that you might compare.

Both airplanes have three hydraulic systems. Compare the primary pump/demand pump system on the B767 to the On/Auto system on the CRJ.

The CRJ-200 uses 10th stage for PACKs and 14th stage for anti-ice without the ability for the high-pressure bleed to supplement the low-pressure bleed as does the B767. Which system is better? Which is simpler to operate?

CRJ has the flight plan log on the nav display and system synoptic pages. 767 doesn't.