I prefer the BDC over the Ballistic plex, and I'd go Buckmaster over prostaff because they have more internal adjustment for zeroing your scope.
I have a 2-7 burris ballistic plex and it was great on a 223, but when I put it on a 1895G 45/70 it didn't have enough adjustment to zero at 100 yards. I have a Nikon Omega 250 with BDC made for muzzleoaders on my encore 209x50. It's a good scope and I like the circles better myself. The dashes like the ballistic plex are nice, but there's a lot of space between them that could cause an error on a shot. The circles have more aiming references. For example, I know that my crosshairs are good for 100 yards, and the top of the next circle is good for 150 yards. It's something like that, but the idea is you can use the tops & bottoms of the circles as aiming points also because there's a pretty good chance it's not going to just line up for you perfectly for whatever distance you're going to be using it at.