"Icarus Factor" definitely felt like it had more life to it - the Pulaski connection was decent, and also (somehow) managed to avoid the feel of the TV trope "small universe syndrome". Worf's subplot was actually way-cool.
"New Ground" had cheesy technobabble for the time - the creeger waves look nice and as a concept isn't bad, but do nothing to inspire, much less move the episode along any faster. Never mind that using the Flagship for such early-level testing is as a little too contrived to believe - but place this episode after' Force of Nature" (the "55MPH speed limit in space episode") and now you've got a reason to use the biggest ship as a guinea pig.
They already had a disastrous ship disaster-themed episode, so why be so quick to have another? Especially when another would hit in a few weeks and would remain compelling for another viewing ("Cause and Effect")? And the "Cousin Oliver Syndrome" trope (adding a new child character to revitalize the show) is given a Trek twist, ends up with disappointing results because we all know Alexander will be quick to change, with no real drama, for subsequent episodes. But that's because he's there for the kids, of which by 1992 most preferred Nintendo over cowboy reenactments.