Better out-of-the-box hardware support, in my experience. We have a machine learning server at work, it didn't see the GPUs on Debian Bullseye with the driver versions specified by the manufacturer, but worked perfectly with Ubuntu Server out of the box.

A distribution that is preconfigured by professionals has great value in a practical setting, even if that value has diminished in the eyes of the kind of person that Lemmy attracts. If I had tried to get Debian working by overruling the manufacturer's instructions, I'd have to take responsibility for it, both its maintenance and the downtime and potential damage if I had fucked something up. With Ubuntu, I get to delegate at least part of the responsibility to Canonical (while covering my own ass), and that's something you can't backport.

I don't know what Maestro is referring to, but Ubuntu has really good out of the box hardware support. Also it streamlined the installation process. Start it as a live CD, look around, if you like it, install it from the live environment. Generally they improved usability.