difference between #11 and #12 is the lower part where is the full name. in #12 it is a bit bigger and aligned to center of the logo :)
also i dont want to add little elements because they get lost very easily and too much information. maiking logo a very confusing. Simplicity on its good level is a good thing
one is light background version other is darker. It has the same effect as like on Shell company logo. that Shell has actually a white stripe around it so everytime you added it to example black background you see a white stroke around the symbol. easy but very cool way :)