Color reproduction is still better on CRTs (assuming your CRT is well-calibrated) but these days only design professionals are willing to pay the premium for that. CRTs can adjust to multiple resolutions, of course, so that used to be a big deal for gaming, but these days most people can find a satisfactory solution by adjusting game settings and/or display settings (of course this may mean "scaling" or "black bars" which bother some people more than others). The one exception may be the largest (eg Dell 3007WFP) displays, which require more GPU horsepower than most people have (or can currently afford) to be used in their entirety.
Somebody correct me if I'm wrong, but, I think the Dell displays use Samsung LCD pannels.
It actually varies, depending on the display. The Dell 2707WFP uses a Samsung LTM270M1 S-PVA panel whereas the Dell 3007WFP uses an LG.Philips LM300WQ1 S-IPS. Dell might use others, too, but Philips and Samsung are the dominant suppliers. Samsung, of course, only uses its own panels in its retail products.
But this is an important point: Samsung aside, many of the companies that sell LCD displays to the customer do not make the underlying panels: there are actually only a handful of panel mfrs. Once you set aside minor features (USB ports, variety of input connectors, etc) you may actually be looking at the same panel when you're comparing screens from two different companies. For example, the Samsung 215TW, NEC LCD2190UXp, Eizo S2110W, HP L2105, all use Samsung LTM210M2 S-PVA panel.
One important area that can vary is scaling electronics: particularly if you're watching movies or console games (where you have less control over the source resolution) you may see a significant difference on the same panel if the scaling circuitry is different.