As far as OneUI 7 coming with vertical scrolling. That is cool. Will I switch to using it? Probably not. Not because OneUI is a bad launcher. On the contrary, OneUI is a very good launcher and I will recommend it along with Microsoft Launcher. Microsoft Launcher is the better choice for my usage. Having been a Windows Phone user for a few years, I enjoyed the integration that Microsoft incorporated into is Windows Mobile OS. When I came back into the Samsung fold, Microsoft Launcher allowed me the best of both worlds. The integration that Microsoft Launcher has with Outlook, To-Do, Sticky Notes, OneNote, and OneDrive and all the great features that are stock on Samsung phones and tablets.
Others will argue that Nova Launcher is the best. Nova Launcher is also a very good launcher, I have used that too. However, to get all of its features, you have to pay for it. Microsoft Launcher and OneUI are free.