For mac, Nero doesn't exist. Roxio Toast is the very best burner program there ever was on mac. In fact it existed on mac before Nero even existed. Toast Titanium 7 is the latest version for mac OSX. For OS 9, you'd need Toast 5.

I'd recommend burning the dvd's at minimum speed. And be sure your set top dvd player can play the dvd format you burn to. Some can only play dvd-r or dvd+r. So check which ones it can play.