In 2019, Apple released iPadOS in contrast to iOS, which runs on iPhones and previously iPod Touch. However, most of the things that differentiate it from iOS are just taking advantage of the visual enhancements or using the Apple Pencil extension.
If you’re a devotee of Apple’s productivity software, there’s little difference. Apple has put a lot of work into the interface for the likes of iMovie and GarageBand to have the same functionality as macOS. And as of May 2023, Apple has added iPad subscription versions of Final Cut Pro and Logic, its professional video and audio editing software, respectively. (Reviews of this are mixed, with The Verge, for example, praising Logic while getting less Final Cut Pro.)
It’s getting more and more Apple’s software and technology where the weaknesses become more apparent. If you are a podcaster or streamer, for example, who works outside the audio/video sources in your show recording “live to tape” instead of adding them after production? You’ll have a hard time finding anything for the iPad that mimics the functionality of, say, Audio Hijack by mixing different audio sources together in real time. The same is true for other apps, because the iPad is not designed to replace a more traditional computer and because the iPad keeps you out of the “walled garden” of the App Store.
In short, macOS gives you a lot of options.