The actaul difference in 5w to 10w on a hand held really isn’t anything. You’re bound by the antenna, height and lousy ground plane. My recent favorite is a uv17 pro v2. It’s chirp compatible, all 3 of mine measured 8-8.5w on 462.xxx and no firmware updates. But I had to wait 8 weeks to get them. However my uv5r, uv17pro v2s, 905s, and my Motorola xts3000s all transmit the same distance. No one can tell the difference on the other end.