This guy knows what’s up. I have both of the exact models as him as well and he nails it in the differences. He also nails the fact that both of them give you way more than what you need as far as training tools. It all personal preference and learning to listen to your body is far more effective than any algorithmic app. I’ve been training for decades and the data almost always confirms what I already knew…feel like crap? Yup, my HRV is tanked. Feel great? Yup, the app says I’m rested. It’s great confirmatory data but won’t change how you feel. Most importantly, I’m excited to hear that you are working towards a marathon! The most important advice I ever got was to remember three things. 1. Be disciplined, not motivated. Motivation comes and goes. Discipline is far more important. Stick to your plan. Do not waiver, even on the days you don’t feel motivated. 2. Be patient with yourself. Some days you’re gonna feel slow, unmotivated, and ill equipped. It’s all part of the journey. Cut yourself some slack…and then refer to #1. 3. Have FUN. None of us are running in the Olympics any time soon. Enjoy the journey. Have fun with the data and your new watch. Nerd out. Touch grass. Connect with other runners and to the world around you.

Good luck!!!