They do different things. I'm using both: uBO for ads and hiding UI elements, uMatrix for JS. I wish that the author could support both but time is limited and I'm OK with that.
By the way, I realized that most of the tabs where I'm logged into something run inside their own tab container, so that limits the damage that any bug on handling cookies can do.
By the way, I realized that most of the tabs where I'm logged into something run inside their own tab container, so that limits the damage that any bug on handling cookies can do.