Should I get a Bluetooth-only or dual-band (Bluetooth + ANT+) strap?

If you train with a watch, bike computer, gym equipment, or multiple apps at once, reviewers strongly favor dual-band straps. The Polar H10 and COOSPO H808S both broadcast Bluetooth and ANT+ and are widely reported to pair with Garmin, Wahoo, Peloton and Zwift. Bluetooth-only sensors are fine for a single phone or watch but can hit Bluetooth's connection limits on shared equipment.