The app is great for tracking and accountability. The biggest thing you need to do is decide you want to make a change and not give up even if you fail from time to time. Like you said in your introduction, lifestyle change is the key!
Garmin Fenix 6. Garmin connect synchs MFP. Garmin fenix series has HR monitor as well as GPS tracking which is way more accurate than Apple Watch. I previously had Apple Watch but will never go back
