Both.
How formal is your function? Apple watch is small and easily hidden underneath shirt sleeves.

Its better that you walk in the store and try on it

what's the reason u doing that?

you can pair few apple watch to your iphone. it has auto switch function.

I’m currently using my Apple Watch 3 for sleep tracking and  Apple Watch 5 for my daily use

Go to the watch setting and turn on auto switch. Your watch  will switch automatically to the one you are wearing

Finally took the bait dy hahahaha

However using it in full airplane mode(solely for fitness)

At the end it is still a watch with extra functions. For the ECG function, it is only actually useful for monitoring irregular heart beats. Especially when exercising which is something not easily picked up in the hospital unless you are doing a stress test. I anticipate more work for doctors in Malaysia after this. A lot of people will start going to clinics to show doctors their watches.

it is actually useful for those who has existing risk factors such as high blood pressue or potential heart decease.

to me better be safe than sorry..so if ECG on AW tells me something at least i will do something about it immediately

Since AW4, I have been watching the ECG review over the internet. You don't really just show the result through app but you actually need to export the ECG results and get it finely print over an A4 paper. (Not screenshot obviously)

Imagine paying the full price for a piece of tech only to realise the "life saving" feature has been disabled.

After checking, countries like Korea, Japan, Mainland China and Australia don't seem to have this feature as well.

I really can’t make up my mind. Which one do you guys think looks better? My wrist size is around 160mm.

40mm

44mm

44mm (2)

if u really need it just go to taobao search ecg ,think 15~30rmb can get la.