Here's my list of DVD drives:
Thomson TGM600: DVD+R, DVD-R, CD-RW (NO CD-R)
Samsung SDG-605: DVD-R, CD-RW, CD-R (NO DVD+r)
Philips (The old one?): Can play all, but it depends on the media, some DVD+R don't work, but an other brand does work, and so the same with all the DVD/CD types.
I have one of the first xbox'es in europe, so it is one with a Thompson, but it works wonderfully well. It read every DVD I give it to him, and doesn't make much noise.
Now I've tried a samsung from a friend of mine, and it makes more noise, and it does NOT read DVD+R, not any brand, it immediately says: Unknown
And then we have philips, 2 friends of mine have these, and alot DVD media do not work for them, only some, that really sucks, you buy a 5-pack and then they don't work.
Best for me is the Thompson, why use a Samsung when it cannot even read DVD+R?