Both products use a server which have a much larger pre-trained models. The professional one has added features such as handling sibilance, GUI to edit note following as a guide for the models, and an editor tool for extracting using harmonics.
(Note: I don't work for this company. I do pay for / use their products, and I also happen to know someone who works there.)
One-click process: Xtrax Stems 2 (https://audionamix.com/technology/xtrax-stems/)
Professional: ADX Trax Pro 3 (https://audionamix.com/technology/adx-trax-pro/)
Both products use a server which have a much larger pre-trained models. The professional one has added features such as handling sibilance, GUI to edit note following as a guide for the models, and an editor tool for extracting using harmonics.
(Note: I don't work for this company. I do pay for / use their products, and I also happen to know someone who works there.)