I have an Apple Watch Series 7. Average battery life is ~30 hours. Less if it runs on LTE instead of Bluetooth.
That watch is more expensive than the Galaxy Watch 4. At launch and second hand.
Now you can get a good/mint condition used Galaxy Watch 4 Classic 46mm LTE for around ~$150 on Swappa. The same tier Apple Watch Series 7 on Swappa goes for ~$225 on Swappa.
And the Apple Watch doesn't even have blood pressure like the Watch 4 does. Granted, you have to do some sideloading to get it working in the States until FDA clears it, but the hardware is still there.