The 1988 ones have better dynamics than the the 2009 ones, but the 2009 ones sound like they were "cut" through a cleaner signal chain, newer digital processors, but seem a little compressed.
Not to say the 2009 ones are "loudness wars" victims, far from it, but the older ones do have better DR, and the newer ones seems cleaner and sharper, a little more bottom and top.
So it's a trade off.
I can't comment on the anniversary remix/remasters, I haven't heard them.