I prefer red dots on turkey rigs. I don't find magnification necessary or desirable for shots to 40-50yds. Red dots allow me to easily keep both eyes open while shooting. They are also more forgiving than either beads or scopes when it come to shooting form. Turkey often reveal themselves from unanticipated directions and angles, especially if they have to negotiate cover while coming. As a result, it seems like I kill at least one bird a year while I'm all twisted-up. Before I went to dots, I found it tough to get the sight picture in a scope or get my head down enough for the bead.
Even so, scopes are still superior than a bead in my experience. I can see myself migrating that way as my eyes age too. Just make sure to get one with plenty of eye relief. I've seen scopes equipped with turkey reticles having eye relief less than 3.5". I don't want a scope like that on a 12ga running 2oz+ of shot. It's a cut eyebrow and stitches just waiting to happen.
