Biology and Biological Sciences are exactly the same thing (I did Biological Science at uni). The different modules that you may have in BSc Biology and BSc Biological Sciences are only due to different choices of different Universities.
If you want to be a teacher both BSc Biology and BSc Biological Sciences are good. Also you don't have to study Biology to be a biology teacher. You can do BSc Genetics, BSc Biochemistry, BSc Zoology, BSc Ecology, BSc Chemistry.