I ran my sixth marathon last weekend — the 2026 London Marathon, and, ever the tech tester, I decided to strap two watches to my wrist for the experience. Sure, it raised some questions on the start line, but the London Marathon is a great test of how well watches really cope with crowds, skyscrapers, and 26.2 miles of recording data.
For the run, I wore the Apple Watch Ultra 3 and the Garmin Forerunner 570. Both watches have bright, beautiful displays and dual-band GPS, designed to boost tracking even in challenging environments.
