I'm guessing there are very few people who can give an answer to this because of the fact that owning all 3 brands would be silly. But I just to say that those names are just to show that the screen is "glossy". I bet there is a slight difference but they all do the samething.
crystalbrite is really sweet. =) i like glossy. =) i always thought i'd like matte more due to reflections, but glossy takes the cake.
the difference between them, imo, is close to none/my imagination. i think the sony might be a little glossier and the crystalbrite medium with trubrite being least glossy. haven't met anyone with a glossy dell, so don't know about true life.
I <3 my Dell's glossy screen, I can't really tell much different between the manufacturers though. In my eyes, the glossy gives it a much better look; the colors look amazing compared to matte screens.
I am a huge fan of the XPS2 screen, which is trubrite I believe.
*Ahem* It's called True Life. Is that what you guys are talking about? Anyways, I have it, and it's pretty nice. The only problem is that with the high pixel density that the 17" WUXGA has, you get the sparkles effect (that's supposed to be what's causing it). Also, it seems that the glossy coating isn't perfectly smooth on the WUXGA screen (it looks gently bumpy like very flat rolling hills or waves across the screen). Anyways, the screen looks really nice from a moderate to far distance, which I would think would make it killer as a portable DVD player with groups of ppl. Not to mention the i9300/XPS2's great sound system (can you say built-in subwoofer? lol).