Not seen either of these, however last year i chose a new bag and made a mistake
I got the Sun Mountain superlight 3.5lb bag and found it not really what i was looking for, granted its light but a bit flimsy for my liking.
In the end i got the excellent Nike Sasquatch 14 way carry bag and its perfect and looks well made and good as a summer and winter bag and also fits well on a trolley.
My advice is see the bags first do not buy online unless you have seen both / them