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I choose the purple patent..

Although I love the metallic silver lambskin, my friend owns one in Maxi size and I feel that the bag is too flashy.. it is gorgeous however in smaller sizes like a WoC for example..
 
I think the grey patent is really nice. No more metallic lambskin for me - I found the color was peeling off on the corners of my bag - sold it at the end.
 
2.1.3 for me..
Grey patent is BEAUTIFUL
purple patent is beautiful.. but might be harder to match with outfits
and i think the silver is too much in a big size.. better in the small or m/l size
i hope my oppinion helps with your decision! good luck