I am having your same dilemma. I just ordered the large matte grey and med silver and can keep only one. I am leaning towards keeping the matte grey since I just purchased a metalic grey lamb maxi a few months ago.
Wow...well I feel the same as you all in being perplexed. Ordered both the Metallic and Matte in Grey, AND the Black with GHW. Keeping the black definitely, deciding between which grey...and boy I wish I could do both, but think that may be overkill....ugh. Let me know what you decide. We need to get pics of both together to decide!!!!