I am still using the face I was born with.
The watch face I plan to use on the other hand, will be the Motion face (Jellyfish)
My only issue with the Jellyfish is that it's slow to appear and the digits on that face are huge. It's pretty, otherwise.
I prefer the Modular face. I just can't decide on a font color for it.
I like it in blue if you're using a black band. It's a good contrast.
I have a friend with a white band who is using it in white. It looks quite crisp.
I have heard a lot of chatter about people wanting 3rd party complications or watchfaces, but I think the watchface is so critical to the working of the watch I think Apple need to and should keep this closed off.