Artemis knows where all your devices are in real-life. That means effects realistically spread across your devices, keeping their distance into account. Not to metion that Artemis works cross-brand, no more out-of-sync devices or limited lighting capabilities!
This project is completely open source. That means anyone can improve upon it. There's also an entire plugin system allowing you to add your own devices, effects and games
Artemis is built for gamers. That means you shouldn't ever notice a performance drop because of Artemis. RGB is fun but if you're fragging hard you don't want framedrops because of the lighting going on.