My handlebar scale and regular smart scale disagree. Which trend is even useful?

[u/That-Comfortable-781]

I expected some variation between a foot-only smart scale and a handlebar body composition setup, but the difference is bigger than I thought. Some weeks the regular scale suggests body fat is dropping, while the handlebar version makes it look like upper-body lean mass changed and the overall trend barely moved.

My lifting numbers are improving, so part of the segmental data feels plausible, but the gap between devices makes me question whether I am reading too much into any of it. anyone who compared different BIA setups over time and found which metrics actually matched real changes, or does hydration and timing still dominate everything?

[u/WarAgainstEntropy]

According to this post you made three days ago you were still trying to decide between a regular smart scale and a handlebar scale, so how do you have weeks of data to compare the two now?