Sidecar vs Luna Display is a question of broad support vs focus
(iMore iPhone)

When choosing between Sidecar and Luna Display, there`s a lot to consider. Sidecar is one of the most prominent new features in macOS Catalina, allowing your iPad to extend or mirror your Mac`s display. You can also use it with the Apple Pencil, which also lets you use your iPad as a connected drawing and markup tablet, much like a Wacom or similar accessory. But Sidecar isn`t the first time this sort of feature has been available for the Mac. Apps like Duet Display and Luna Display have been offering this type of functionality for years. Luna Display, in particular, is great for turning your iPad into a second, interactive wireless display for your Mac. You just need the hardware accessory. Though Sidecar is free with macOS Catalina, are there reasons to choose Luna Display instead? Let`s find out. What are Sidecar and Luna Display? Sidecar and Luna Display are, at a conceptual level, the same sort of thing: they turn your iPad into an extension or mirror of your Mac`s display....