Even after disabling quite a lot of telemetry settings Windows 10 sends out a ton of stuff. I didn't even know about all of those until I started using piHole.I have been using only windows 10 ltsc 1809 and defender for past 8 months now,the amount of bloatware they put into this shit is just below Xiaomi (funny since I'm typing this on my redmi note 7).
This is the stats for a single day only.
Xiaomi in my experience is no worse than Samsung going by pihole logs and comparing the blocked queries on my Galaxy S9 and my mom's Note 5 Pro,
OnePlus seems to be very decent though.