The truth is hardwire is an order of magnitude better.
That is a bit of an exaggeration. While I totally agree that a hardwired system should be the most reliable of all, it certainly is not an order of magnitude better. That would mean competing systems work only 10% of the time, or 1 command out of 10 actually works. One could probably do better than that throwing tennis balls at wall switches.
I doubt that anyone would accept even 90 percent reliability - I certainly wouldn't. The question is how many 9's you need after 99% before reliability is adequate for you. A hardwired system will provide the most 9's. X10 may be the most susceptible to problems in an improperly designed system, but it can give a few 9's when used properly.
It is known that electronic devices can cause problems for some automation systems. If you don't go completely hardwired, I strongly recommend arranging circuits so that your electronic devices are segregated onto their own circuits. And add the appropriate filters to any circuits that will power compact fluorescent light bulbs. The small Leviton 6287 filter will fit into the back of deep electrical boxes, and will suppress compact fluorescent noise for both Insteon and X10 systems.
Hardwired is the best, but it is a costly option, and not one that can easily be evolved as your needs change.