Let's just say if I had my druthers, I would not choose Ubuntu, and I really wouldn't choose the Nvidia/ARM spin of Ubuntu. The Strix Halo has the benefit of being entirely a normal x86_64 PC that happens to also have a big chunk of unified memory. You can put pretty much anything on it. Any Linux, regular Windows, probably even a BSD (though good luck getting AI stuff working there).
But, as I said, if you're spending $4000 exclusively for inference and AI workloads, you might as well get the Nvidia-based unit. It is better for that.