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Rich,
Some Dr.'s think Aromasin(Exemstane) may have a slight advantage because it irreversibly binds aromatase where the other two do not. Some Dr.'s say there is no difference because they all inhibit estrogen production so well it doesn't matter. Time will tell, but there definitely is some data that suggests Aromasin is more bone friendly than the other two and this is due to its steroidal nature.
The reason why some drugs tend to be more popular than others is marketing. Arimidex had the best sales pitch and it got the most publicity.
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