hmmm! Tough question! I think identical twin girls would be so cute, but maybe harder when they grew up having to be compared and share things. On the other hand, raising 2 boys together I think would be easier but that's all I know. MY DH said he wishes that DS2 was an identical twin because he is so sweet and having 2 of them would be easy!
I have heard girls are harder, but what do I know! I will say my boys are really easy!!!