I've been using a Coros Pace 2 for a year now to broadcast HR to my Garmin 130. It's usually marketed as a running-focused watch, but I got it even though I'm not a runner because it was inexpensive for the features important to me (GPS, HR broadcast, barometric altimeter), lightweight, not too big on my wrist, and had good battery life. I'd rather not deal with a HR strap and this was a good compromise; I also use it as a bike computer for my commuter, to track hikes with my wife, and to track time/distance/HR for pickup soccer.
If I broke it today, I'd definitely consider getting another one, but also be taking a look at the Coros Apex 2/2 Pro, and the Garmin 255/955 (has maps, but kind of big for me). Looking at the Amazon listing for the inexpensive Chinese watch it's not clear if it broadcasts HR; definitely for road biking it's nicer to have that on the bike computer vs. needing to look at your wrist.