Do I need ANT+ or is Bluetooth enough?

For phones, modern watches and most apps, Bluetooth is sufficient. ANT+ matters if you're pairing to older Garmin head units, gym equipment, or want to broadcast to multiple devices simultaneously. The Polar H10, Wahoo TRACKR, Garmin HRM 600 and Coospo H808S/H6 all support both, which is why dual-band straps dominate the top of most rankings.