In my opinion, they are equal.
All DIL singles were top 5 hits (if you don't count the promotional single with Luther), all videos are awesome, it sold more than 10 million WW and won 5 Grammys. The only thing it lacks is a proper worldwide tour.
IASF was the era that made Beyoncé more global than she already was. Single Ladies is still a phenomenon, I Am...Yours Tour grossed $120M and won Bey 6 Grammys. But some videos from that era were so sloppy and the single releases were a bit messy, some hit potential songs were wasted.