The chief differences are image quality, cost and space. LCD displays are often superior on image quality and take up less than half the space. But CRTs win on price, sometimes costing less than half the price of LCD displays. The main development in CRT technology has been in flattening the screen. Most standard CRT screens are slightly curved, which attracts glare.
Flat screens retain a more even focus from edge to edge and catch much less glare.
That would seem to be a fairly easy improvement to make, but engineering flat screens turned out to be fairly complicated. The end result for consumers has been enhanced viewing, at prices now only slightly higher than the cost of traditional fish-eyed monitors. LCDs are flat and always have been, so glare isn't an issue. Improvements in the manufacturing process are the most important development in LCD screens. Sticker prices are expected to continue falling.