Argh... that's tough... The Audra is really cute... but I'm biased as I own the black Alma - and love it. The Alma is probably more practical in size and shape plus zipper...?!
I think most people tend to wear darker, richer colors for evening, so black multicolor would look more formal. I do love the Alma, but I would say it is not appropriate for a formal situation. The Audra's size would make it appropriate as a bag for evening, if you need more room than a small clutch provides, and as a smaller daytime bag too.
I bought a black Audra in January and I adore it. I wore it on vacation last week and got lots of compliments. It actually holds more than it looks, I love the chain details, and did not find the chains to be a problem in any respect.