Almost everything have already been said, but to conclude it:
1) DVD-R is the most compatible, and have always been, but the difference is very small and if you have any recent player it will probably accept both formats.
2) DVD+R is teoretically better, and probably in real life to. It's tracking of the laser is better and the error correction makes DVD+RW more reliable (not sure if it's better for DVD+R to or only DVD+RW compared to DVD-RW).
3) For media which isn't **** look for Taiyo Yuden either unbranded or under whatever brand, for example Verbatim, or get Verbatim MCC 004s (16x DVD+R) if you want since those are also good, cheap and easier to find. Many store might not spec what kinds of discs it really is, in that case you can buy them and look yourself or find a better store. Taiyo Yuden DVD-R discs are named TYG02 and TYG03 for 8 and 16x, their DVD+R are YUDENT002 and YUDENT003 for 8x and 16x, the 8x discs are considered better so the best non EMC (?) gold archival disc you can get go for 8x dvd+r taiyo yudens.
SVP in UK sells them.
Americans order from Rima.
Probably many more does aswell, it's just that I don't know who. Here in sweden Dustin and some more company, maybe it was wesellcd sells the Taiyo Yudens to, but they are like 4 times more than from SVP in uk so I order from SVP.
For more information about differences of formats, discs and what works best in this and that driver visit cdfreaks and cdrinfo.
I have no idea what works best with the macbook pro thought, i guess the drive can be less good than the best regular drives.