I currently use a Garmin 920xt. I was a long time polar user but I'm somewhat happy with the switch. My max hr is much higher, about 205 running, 15 less than that riding. I like using a hrm for calorie burn calculation but also as a coach for my race training. I've made a lot of progress in my running by adhering to zone 3 for the majority of my training. On the bike I am not as good about following a hr based program, but I'll get to it.
2007 Trek 7.2 FX
2015 Felt F85X with Specialized Oura seat, Specialized Road Pro II handlebars, and Look Quartz pedals