[Electronic M]

CED IIRC only lasted from 1981-~1986. The disc caddies were bulky compared to LD's and the video quality was approximately equal to VHS.

LD lasted from~1981-2003 it won the format war over CED. LD had as good of resolution as the video source was capable of (in japan there were even MUSE format analog HiDef LD's released), and the discs were not in BULKY caddies like CED. There were smaller LD sizes too IIRC 10" and 8". I believe the main reason LD never was as big as DVD and VHS was cost. New players usually were $100+ more expensive than a VCR and lacked recording capability.
LD's had a modest market of videophiles, Home theater enthusiasts, and film junkies that wanted to be able to punch in individual frame numbers, and have max resolution. The only consumer tape format that could compete quality wise was ED-betamax, but it was released so late in the tape format wars game that there were really no adopters, and LD already owned the high quality pre-recorded material market.

In LD's heyday most value minded consumers went for VHS.
DVD started expensive, but got cheap, and it had a major thing going for it: DVD-ROM drives built in to new computers (so computer buyers ended up with a free DVD player even if they did not want one)....When consumers realized their computers could play DVDs they started buying them and came to support the format...Plus LD many videophiles jumped on the DVD band wagon when it was expensive (helping drive costs down). There were LD data discs and LD player/LD-ROM drives too, but they were not normally sold built in to a computer....Nor were LD-rom drives extensively popular.