Well to make some blanket generalizations (which are always open to critique)....
X10 - very old technology with spotty reliability due to powerline noise. The newer technology systems listed below seem to work much better
Insteon - a really nice concept with spotty implimentation. There have been quality control issues that have plagued Insteon for years. Personally I've lost trust with that system and would not recommend it. But while many users have had issues, not everyone has, so the system can work. But my humble opinion is that it just isn't worth the risk/investment if you are starting a new system from scratch.
Zigbee & Z-Wave - two newer technologies that might sound similar, but are very different. Zigbee and Z-wave are not compatible with each other and many times not compatable with other similar systems - i.e. one brand of Zigbee devices may not work with another brand of Zigbee devices. Seems to give good reliability as long as there are enough devices to create a mesh network. In other words, it might not work if you only want to install two devices on the opposite side of the house from each other depending on how much distance it is between the two. But reliability and distance goes up as you add more devices.
Lutron (RadioRA or RadioRA II) - arguably seems to be the most reliable wireless lighting control system out there right now. RadioRA II is much better than the first system. Cost is slightly higher than many other wireless systems, but not absurdly higher.
Hopefully that gives you some ideas to run with. The types of devices offered in each system also greatly varies. For example, while I really like the Centralite Jetstream System (Zigbee based), it is fairly limited in the devices being offered (no fan module for example). Therefore it might not cover all the goals you require of a lighting system.
PS - for full disclosure, I do not have any lighting system myself (so I am not trying to push a specific system or brand). I have done a lot of reading and research myself because I would like to add lighting to my automation system, but haven't pulled the trigger on anything yet.