If you plan to release birds that you raise, I would definately get wild turkeys. But before you do, check your state laws to see if it's legal for you to posess them without a permit and if it's legal to release. BB type turkeys are definately not a good candidate to release. In my experience, the bronze get bigger than the whites (but they were hatchery stock sold as Mammoth Bronze). They did look smaller due to their coloring so I was surprised at the weight when processed.
I held a pair over one year, then came to the conclusion that there was no way that I could do AI by myself (and the husband and kids had NO interest in helping). At about 18 months the tom processed at 36 pounds. While it may be possible for them to breed naturally, I don't think it's likely and would be really hard on the hens. Now I just have a few hens that I held over and am trying to cross with a white holland tom.