If you’re deciding purely by overall scoring, Avantree Relay comes out slightly ahead, driven by excellent portability, strong connectivity, and high customer satisfaction for travel use. It’s the better pick for flights and any situation where you need to convert a 3.5mm headphone jack into a Bluetooth source, with the added bonus of connecting two headphones at once.
However, for the most common buyer question—“Which is better for watching TV at home?”—Avantree Opera Plus is the more appropriate choice. It’s designed around TV outputs, emphasizes clearer speech, and specifies low latency for video. The trade-off is durability: review trends and scores suggest Opera Plus is more likely to develop wear or cracking over time, even though warranty/support experiences are often positive.