Given that the factory injected or brined is nothing more than salt, sugar, spices, and broth....I see no real difference in the frozen pre-injected/brined birds versus fresh. Except that we do pay more for the fresh birds.
I may try one from the Chop Shop in Asheville this year. They have some old "heritage" breed turkeys that are supposed to have a more original real turkey taste. Much like high production pork, turkeys have been so hybridized that the flavor and color of the meat ( pork in particular) does not resemble an old time heritage breed. It is pale and devoid of tone. ( much like me
) Might be a fun experiment - if it does not break the bank to cook a Butterball and one of these "old time" breed of birds side by side.....