ionic creator is good to hack something together really fast, but i think until now it does not have the functionalities to use it in a very professional way.
So to build professional mockups or click-test dummy for customers i prefer codiqua.
You do not need the ionic-components in there… because you are creating mockups… you can also make sketches by hand.
Mockups are there to get an idea what views will be there and how they are structured.
After that you will make a screendesign where you put together the final layout.
So do not waste too much money/time for mockups.