Thank you for your interest in embedXcode. I tested Visual Studio Code with the dedicated Arduino extension but wasn't happy with the splash screens.
The first main difference relies on the underlying IDE: Xcode versus Visual Studio Code. So it is more about which IDE are you more familiar with. Xcode is a very polished IDE with code-sense, check-as-you-type, and the features listed at A Glimpse of Xcode.
The second main difference is that embedXcode uses GNU make as build manager and not the Arduino Builder (with the splash screens).
The best way is to see by yourself and give a try with the embedXcode standard edition.