I like the fujinon lenses better because the speed of their zooms is markedly faster than Canon’s. The focusing adjustment is quicker too. This comes in handy for me because I do a lot of reality/sports/doc stuff, where there are no second chances.
The glass is all pretty much the same between the two…If you have the money and want a “second” lens, then go beyond a WA (which is really just an effect lens) and try out the wide Zeiss Digi Prime…then you’ll start to see some noticeable glass difference. I used one this summer and was blown away by the images I got.