this is a question only you can answer.
the Blazor UI is html based, and your app's UI is html based, and the look and feel is like a browser app. You can get a very custom ui look this way.
MAUI UI is a wrapper around native controls, so the app has a more native look. But the wrappers are lowest common controls, so it hard to get a custom look. Also a big complaint is the navigation is also not completely native. Because IOS and Android have conflicting navigation norms, this will feel subtlety wrong for each platform (navigation buttons not quite in the correct spot, navigate feel not quite right). The apps are quite usable, its a tradeoff.
while you can use the native ui directly rather than using MAUI UI, this is typically more difficult than just using native languages and having two code bases.