It just doesn't stick with you the same way R&S does, no where near it. DS9 takes the week.
You know what? I had the exact opposite reaction!
Between the Darkness and the Light is one of my very favourite episodes of B5, whereas, although
Rocks and Shoals is good, I found it a slight let-down after
A Time to Stand. Certainly,
BtD&tL is seared into my brain in a way that
R&S is not (and I saw the latter more recently).
I think B5 gets pretty much everything right in this episode. The plot moves along at a relentless pace, but we also get enough character and thematic stuff to give the story weight. Most strikingly for me, although I had a pretty good idea of what was going to happen to Ivanova after this episode, her fate here still had a great impact and that's a good trick to pull off (like how, watching
Second Skin, I half believed Kira really was a Cardassian, even though I knew for sure that she wasn't).
Rocks and Shoals is a good episode, but I don't rate it quite as highly as many fans do. The stuff on the planet is good and the Vorta was a memorable villain, but it lacked a certain intensity for me. The scenes on DS9 are probably the best bits. Kira and Odo are in a fascinating situation.
It's interesting to compare these shows now that they're both in arc mode: for me, these episodes of B5 (i.e. everything from
No Surrender, No Retreat to
Rising Star) have a greater energy and intensity than these episodes of DS9, good though they are. I also personally found myself caring more about what was going on in B5, which I guess is due to the way we've watched Earth sliding into dictatorship over the last few seasons and seen the characters having to react to that. I really appreciate what DS9 is doing with this story arc, but to me the Dominion War can't match that for impact - it's not so personal. Also, I tend to think that episodes like this are what B5 does best, whereas what DS9 does best, for all its good story arcs, is more standalone, character focused episodes.