Both.
Only because the typical 'meat' birds are slaughtered at a younger age, thus are more tender.
I slaughter cockerels (from hatching layer replacements) at about 14 weeks, still rest them for a few days, but can put them on the grill instead of slower cooking techniques.
Important how you cook a bird, also important is to let the cleaned carcass rest in fridge before freezing or cooking. Anything between 14 weeks and 12 months I'd rest for 3 days.
Older birds get 4-5 days.