This debate is getting a bit too testy a little early don't you think?
I am just going to throw a quick comment in, and then ill leave this thread before it gets any worse.
Here is how it is.
I watched both players play. Harvey is the greatest defensive defenseman I have ever seen play. There are instances where I would consider Orr just as valuable defensively, and he had all the tools of vision and even more speed, and the ability to completely stop an opposing powerplay singlehandedly.
But overall, Harvey was the best I have ever seen defensively. A wizard. I have little doubt that if you put the best danglers in the game against Harvey one on one that he would pick their pockets and transition the puck up ice. His ability to control the tempo of a game was also unmatched. Its hard to imagine what his +/- would be like, but it certainly would be among the best ever, with his ability to control games 5 on 5.
The guys I have immediately following him on the defensive end of the spectrum are a tie between Serge Savard and Rod Langway, with the Lidstrom's, Bourque's and Chelios' coming within the top 5-10.
But the posts I have seen here are misrepresenting Orr as well. Orr is also in that top 5-10 category, maybe just outside of the top 10(I don't know unless I make a list), and Orr could have been top 2 had his focus been on that end of the game instead of being more valuable by, well, scoring unlike any other defenseman could.
Orr minimized quality chances against, using his positioning to steer guys to the outside and wide, ruining their shots and blocking their passes. When they did try to pass through him, he would stuff those passes and then take the puck up the other way on a rush. He would dive to the ice to block shots, and played with maximum effort every shift, controlling the tempo of the game. He was strong along the boards, and physically controlled players without putting himself out of position.
The only, ONLY reason he is not top 2 is that his rushing sometimes, albeit rarely, put him out of position. Orr's speed got him back 95% of the time to make an outstanding defensive play. Most of those I consider ahead of him defensively rank thus because they played safe stay at home, outlet style passing without deep pinching, thus minimizing their
I saw a few comparisons to Paul Coffey in this thread, which are completely off base. Coffey used his speed like Orr true, but Coffey was nowhere near him defensively. He might get chippy in the corners like Orr, but he lacked Orr's ability to control the play without the puck while there, and Coffey was near useless in front of the net. He played the puck instead of the man way too often and often had a blank "What do I do" look on his face when he did not have the puck. Not as bad a Phil Housley, but not worthy to be mentioned with the greats defensively.
Orr did not need to "Mature defensively" as Canadiens1958 put it. He was already there.
Posting the worst game in his career, and a completely off base example is just wrong and a simple attempt to detract from the greatness that was Bobby Orr. That would be like me posting Nick Lidstrom's terrible -4 game from a few years ago and using it as an example of what he is like all the time. Completely misleading.
We have uploaded multiple Bobby Orr games. I suggest you watch them.
http://hfboards.com/showthread.php?t=593861
And to the original question......Neither and both. Some defensemen still rush the puck today, albeit none as well as Orr, and others play the safer transition game offense of Harvey, although none as well.
But there is absolutely no question that the better defenseman was Bobby Orr.