My turbo trainer set up is exclusively Ant+, and the only reason I didn't try Fulgaz is that they only support BlueTooth, which has only ever given me grief in any dealings with it.
Incidentally the months that I spent grinding up mountains with serious resistance in BKOOL are something of a miracle because this time last year my knees were clicky, popping and painful. I was limited to light spinning, and even gardening was a problem. For me salvation came in the form of strengthening my glutes - maximus to cure my sciatica then medius and minimus to fix my knees ('clam shells' for the latter). Cyclists are probably more vulnerable than most athletes to weak glutes - they are unlikely to make us faster until our knees go!
Another exercise that I do is indicated for 'Runners' Knee' and is said to put the kneecap back into its groove to stop the clicking. That one's lifting the lower leg from the knee whilst the foot is turned out. That can be done sat up, but I do that one lying on the bed - lower legs off the edge. It's one I used to do until the pain went away, but now do it each morning as a preventitive. 'Clown' walking (and cycling knees out) looks silly, but helps activate those precious glutes and for cycling at least may put the vulnerable knee joint at a better angle.