I voted a lot of B5, but kept wanted to add a "but..."
The thing is, at its peak, B5 captivated my attention & interest more than DS9. I thought the story was more epic & exciting (and dare I say, a fair bit higher in concept) and I was well & truly hooked. But (there it is again), it didn't sustain the peak. Neither did DS9, mind you, but it was very good for about 4/5 years and average over 2/3, whereas B5 was utterly superb for two seasons, average for a couple and pretty poor in the last series.
I don't really like comparing them too; it's just good that we had two such fun series to watch.