It might just be personal preference. I've found that a combination of a Polar (I use a chest strap for accurate calorie burn) and then google fit on my Huawei for the rest of the day as a pedometer. You can also use the polar for an all day pedometer thing, and there are polars you can get that will receive smart watch notifications. Polar is pricey though for a half baked smart watch.
Because google fit works well for me (it's not as flow-y and pretty like Apple's fit or the Polar app, but it gives you a good baseline and combined with a GPS enabled smartwatch, works great) I have just stuck with my Huawei. I just ordered the LG Style for 150 from Amazon.
That all being said, I think my point is that Google fit is a good fitness app. (I couldn't really deal with Samsung health, but to each their own) and I'd opt for a smart watch that will run android (google fit) instead of a fitbit band....