I use both very frequently and here is my conclusions on these 2 scanners:
Epson: It's VERY fast. Boxing design, but like someone else mentioned... who cares? It got fairly warm as I scanned countless photos back to back which I'm not sure if it should be of concern.
Canon: It's average in speed compared to other scanners. Takes up very little space. No power cord!!! which I love since it's one less cable to clutter my area.
The quality of the scans were identical as far as I can tell in all the modes. But then, I'm not the picky type when it comes to color integrity nor do I zoom in 1000% to catch the minor defects.
After using both scanner extensively, I eventually ended up getting the Canon because of its small size, no power cord, and similar image quality. The only minus is that it's slower than the Epson, but if you haven't used an Epson scanner before, you will think the Canon is pretty fast.