I would expect the Canon software and drivers to be a tad better than Epson. Have several Canon scanners around here and they have all been very good.
I’d expect the optical hardware to be more alike than not in any of the available low/mid-range scanners, so it really boils down to driver and software implementation in the various offerings. In other words, how well do they let you make adjustments and get the best out of the scanner. Never expect perfect results from default out-of-the-box driver settings.
It’s also critical have have your monitor properly calibrated, and appropriate color profiles installed in Windows.
For disc and cover scanning, you are essentially working with printed material much like a magazine, about 150 DPI resolution. This presents some problems, moire being the most common. It certainly does not require a high-end scanner. Best results will be obtained by using a “de-screen” filter when scanning, scan at 300DPI, then open the image in Photoshop and re-sample to 150 DPI. This will eliminate most if not all moire. Perhaps you just need to do some fiddling to get better results from the Lexmark, although AIO scanners are not noted for high quality results.