Google’s canonical example for a query to trigger this new panel is “Quartz Vs. Granite.” This query brings up the usual snippet, plus subtopics like cost, benefits, weight and durability. Those topics are automatically chosen based on what Google’s algorithms understand about this topic.
You don’t need a [vs.] query to trigger this, though. If you look for something like “emergency funds,” you’ll also see a similar panel.
For now, I was only able to trigger these new panels on mobile, but Google says it is rolling out this feature over the coming days, so it may be a while before you spot one in the wild. I was also unsuccessful in triggering them with any other query I tried, but maybe you are luckier than me.
Google notes that today’s announcement is part of an ongoing effort to provide more comprehensive results to your questions. This February, for example, Google started showing multiple featured snippets when its systems think a query has multiple interpretations.