The poll is flawed because Insteon doesn't have any software to control it now nor does it have enough devices to be used in a "true" Home Automation setting "As Is"!
Although Insteon has many significant advantages, is not yet ready for "prime time" in the Home Automation field because it can not yet be "AUTOMATED". Everything still has to be manually first started. You can not walk into a room and have the lights turn on and dim, and go off after you leave. You can not have it notify you there is a car entering your driveway or your garage door has been left open. It can not active a security camera, record the event and notify you by cell phone or email, or turn on inside and outside lights to ward off a potential intruder.
Yes, you can push a button or a switch and have it turn on various lights, but that is basically it. Until there is powerful software that can integrate with a security system, such as the Elk M1 Gold, then Insteon is not going to be used by installers of Home Automation, just us that want to "play" with it.
Until then, with all the software and hardware device support, UPB is really the best of the two for now and the only one to choose for "True" Home Automation.