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Since you want a turkey with a lot of breast meat that grows quickly, you will want to get the Broad-Breasted Whites (BBW) or Broad Breasted Bronzes (BBB). The heritage breeds do NOT get much breast meat and they grow very slowly (7-10 months to maturity) and are smaller in size overall. Totally different type of bird. The BBW do not always do well beyond their growing period of 4-5 months because they are bred to fatten quickly.
The reason to buy a heritage bird is because: it has superior flavor and wonderful dark meat, forages on its own (feeds itself on bugs and grass as a supplemental food), can fly and breed naturally (BBW are all artificially inseminated because they have been bred for such large breast meat that they can no longer "do it" because the large breast gets in the way). A heritage turkey is generally healthier and can have a long life if desired and makes a great pet. They are prettier-looking (BBWs are bred only for meat, so their feathering looks terrible and they can barely walk they get so fat so quick and they generally live on the ground). Many people raise heritage turkeys in order to keep the gene pool alive, since 99% of commercial turkeys are BBW.
Hope that helps!