Decisions on issues that have high political salience tend to be the ones that make news; there is currently something of a correlation with political salience and 5-4 split decisions on the courts, since Justices positions are most ideologically (rather than legally) consistent on points that were politically salient at the time of their appointment, and the issues with the strongest political salience also are often relatively consistently salient over an extended period of time, and since the court splits at or close to 5-4 on a lot of enduringly-salient issue areas.

But plenty of 9-0 issues on issues that have current salience make news, and 5-4 decisions on which the justices are split but there isn't a great deal of political salience often aren't treated as any more newsworthy than any other decision.