in truth, most people that dont use aromasin/exemstane are not using it because of poor/old or generally just incorrect information.
generally most people that reccomend anastrozole either dont actually know any better or they are highly central producers of aromatase (usually very lean individuals with generally low aromatase levels or those with highly centralized aromatase synthesis (adrenal upregulation, variocele, hepatic, etc..)
this is not to say that anastrozole is not a better choice for some users, just that in general most people respond better to exemestane with less sides of central type suppression (in particular high level suppression of estrone synthesis in adrenals and gonads-- estrone being the tremendously weaker estrogen--)