As a general rule, metals will be more extended, subjectively offer more "detail" and will be "harsher". Soft domes are thought to be less agressive, the best not losing out on "detail". BUT, there's a number of variables that ultimately determine how good the system sounds; cross-over point, phase matching with the mid, etc, etc.
Is this a general question or are do you have a specific project in mind?
Is this a general question or are do you have a specific project in mind?