I just came back from that area this past weekend. We played Pine Needles, Tobacco Road, and Mid South. Ran M hosted me at his Southern Pines course 3 years ago while it was partially renovated by Kyle Franz, and I loved it. I like it better than #2 and Pine Needles as well as Dormie Club.
Tobacco Road remains for me as a course I'll always want to play again when visiting the Pinehurst area. It's fair with just the right amount of ridiculousness and silliness. It is designed to appear challenging and intimidating, but making par is easier than the impressions from the tee box. Every hole is unique and very memorable.
I cannot say the same for Pine Needles and the other courses. So if you haven't played TR yet, make time for it. Pine Needles, Southern Pines, and from what little I saw of Mid Pines, all dress similarly, making it hard to remember which course a hole was on.
That said, Southern Pines had the most design diversity of those three.
Also, I got a sneak peak at PH #10 and it is indeed very different from the other big 2 courses (2 and 4)