FLARM vs ADS-B
There's been a litany of recent midairs with at least one aircraft ADS-B equipped. And yes, there's been midairs between FLARM equipped aircraft where one FLARM was inop.
When it's properly installed and working in both aircraft FLARM does the job very well. With ADS-B becoming more common, I see more low level aircraft on my FLARM and I'm more than happy to get out of their way even if I can't reach them on radio.
While many assert that a proper lookout will keep you safe, I look upon FLARM as a backup against human imperfection. It really does see better than I do. Atmospheric conditions, background and sun glare can do an excellent job of hiding aircraft even if you know where to look.