Teaching experience, sadly, is not the main thing that top school's ad comm look at. They are interested in getting in people with outstanding good research potential. Hence your research experience and LORs are more important.
Having said that, you can use your teaching experience to emphasize your desire for an academic career and communication skills. Also, some schools - such as NYU - ask your evaluators to assess whether you are able to teach an MBA class. So your teaching experience will come in useful to assure them of your teaching capabilities. Talk about it in your SOP. But focus on your research experience first.
My 2 cents worth.