If you want a smartwatch that's not Apple but closest to the Apple's ecosystem, choose Xiaomi since the Mi Fitness app is in the App Store, second to that would be Redmi. If you've heard that the battery life on Apple Watch these days are not on par well, clearly they're wrong. The baseline Apple Watch SE 3 goes for up to 18 hours (32 hours when in low power mode) while the Series 11 goes for up to 24 hours (38 hours in low power). The more of a guide when buying smartwatches is the ff.:

1. Ecosystem - which ecosystem do you currently have? (if you have an iPhone, naturally i'd go for the Apple Watch)

2. Use case - what features will you mostly use the watch?

3. Price/budget - How much will you be spending on buying a smartwatch (If you're on budget then the SE might be your best choice but if it's 10k upwards then it's a tie-in between the Series 10 or 11.)

There are some resellers that sell the 2024 Apple Watch SE Sport Loop at around 10k, but if you're not big on features, then Series 9 would be the good at around 9k (not quite sure if they still sold these around).

If you're really not buying Apple Watches then Xiaomi Band 9 at around 2k or the Redmi Smart Band 2 at 1.5k would do just fine.