Smart watch or normal watch

Like the sentence " don’t mix investment and insurance we should not mix smartwatches and health"

Bro apples connectivity is unmatched. My friend has Samsung watch but he complains about connection drop lags and unreliable fitness scores. Try apple cellulwr watch

buy casio gshock  and be happy ,smart watches are annoying one more thing to charge  everyday 

I don't know which sources you accessed that deemed Samsung Watches are accurate but in reality they are anything but. Apple Watches are the gold standard closely followed by Pixel Watches from 2nd gen. onwards. Because Pixel Watches cannot be repaired and battery life is short (not that Apple does much better) it's not as attractive. Spending 18k for a product that may only be useful for 3-4 years isn't palatable in my case. Huawei Watch GT 5 was available for Rs 13k, warranty and aftersales concerns aside it's very good in terms of accuracy barring Sleep stages monitoring and battery life at 6-10 days is outstanding. However ECG is only available in the Pro version which is significantly more expensive. Fitbit Charge 6 gets close to the Pixel Watch 2 but it's not durable unfortunately. HR monitoring in recent Garmin Watches is finally enhanced though there is still room for improvement and other than their higher prices they are very good. 

At under 10k only Huawei bands, if available in India, are the only viable option. OP2 Watch is very good in terms of battery life but sub-par in terms of accuracy. At 5k or lower Xiaomi bands are better in terms of accuracy but only because their competitors are so poor.

P.S. If the fit isn't near perfect the accuracy will suffer. Also Google cadence lock. Skin tones also matter when it comes to PPG sensors.

I'm a watch guy. I know a thing or two about watches. 

Smart watch -- Bought one, Moto 360 Gen2. Using it since 2017. Still in great shape. Back then I was on Android, Samsung Galaxy and Note series devices.

Moved to Automatic Watch, Swiss, Tissot Seastar 1000 Powermatic 80. Great watch.

Then bought a Fitbit Charge 5 -- I can wear this 24/7!!

So, long story short, all you need is a good health/fitness band (Fitbit/Garmin) and a good watch (Titan/Timex/Casio/Seiko) as a budget buy. I won't touch the 'fashion' brands.

Watches has capacity for navigation + call + camera + fitness + bp + oxygen level + messages + QR code + many more, but if someone seriously want to use. Just purchasing any features rich product bydefult does not make it useful.