I love my small lambskin flap! I don't have a mini, and I know people love those, but the small feels like a more substantial bag to me. No offense to anyone, but the mini just doesn't have the presence that the small has. Small goes easily from day to night, and the double flap doesn't bother me. Because I love cross body wear, I had a reputable company that has worked on Chanel bags for many years add some length to the chain. I don't plan to ever sell this little beauty, so I wasn't worried about altering the chain. I will add that I already had two Gucci bags that filled my "mini bag" void, so I wasn't looking for something with that small of a profile when I bought my small flap. Both are lovely bags, you really can't go wrong! Let us know what you decide. 
