I have killed turkeys both ways. I don't do the roosting thing anymore. 90% of the time when a tom flies down off the roost he is already hened up anyway. I changed my strategy a few years ago. I don't go hunting now until about lunch time. Toms seem to be more responsive from mid day through the afternoon. I have had toms literally charging me after a little calling during this time. Don't get me wrong, I will still hunt some mornings just to mix it up. Anyway, just my two cents.
"I've always believed that if you put in the work, the results will come. I don't do things half-heartedly. Because I know if I do, then I can expect half-hearted results"