Hello,
Maybe it is the way the ‘A’ on your second logo is represented. On your sketches the Ascender’s are present but on your final artwork they are missing. I can see why you have done this but as a standlone logo other viewers might not get that it represents the letter A.
As ToivoMedia said it may be that they are too specific. If was to purchase these logos that company I am designing for will either need to start with M or A.
Hope this helps 