Here is My favourite 5 smartwatch . I personaly like them. I Gave my opinion on it. If you want then you can buy one of the.

Apple WATCH source

Apple Watch Series 3 : It is very good smart watch From Apple.It is one of my favourite smart watch thats why i
marked in 1. If your budget is around 400$ then you can go for it . It has a dashing look because it is from apple. Apple Product are always awesome and very good for daily use.

Features:

Built-in GPS and GLONASS
Dual-core processor
W2 chip
Barometric altimeter
Memory 8gb
Water resistant 50 meters
Built in Wi-Fi
Built in Bluetooth 4.2
16-18h battery life
watchOS 4
Magnetic Charging System

I will personally recomanded you for Apple Watch Series 3 if you have a big budget.

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2 .LG Watch Sport : Its a good smartwatch in around 240$ Budget. It Comes From LG.

Features:

1.38-inch Full Circle P-OLED Display
4G LTE Wireless Connectivity
"OK GOOGLE"
Make Calls
Wireless Charging
IP68 Water and Dust Resistance
ANDROID WEAR 2.0
Alarm, Timer, and Stopwatch
Customizable Font Sizes
1.1 GHz Qualcomm® Snapdragon™ Quad-Core MSM8909w Processor
1.38" P-OLED Display
768 MB RAM

So it was its features you can buy it. It is good on this budget

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3 . Amaze Fit Pace : Amazfit Pace watch is our GPS-enabled sports smartwatch .Its automatically tracks your daily steps, distance, calories, and sleep. Activity and sport modes for: Outdoor/Indoor Run, Trail Run, Walk, Outdoor/Indoor Bike, Elliptical, and more. It is Mid Budget Smartwatch . Its Price Around 135-170$. It has a Very great Bettary life. It comes in 2 color orange and grey.

Features:

Built In GPS
4 GB Storage
Run Tracking
Heart Rate Sensors
5 days of battery life
54.5 g Weight / Lightweight
1.2 GHz Core Proccesor
Built In Bluetooth 4.0
Built In Wifi
IP67, resistant to water and dust
1.34'' Display size
1-YEAR LIMITED WARRANTY

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4 . Sumsung Gear Fit 2 : Sumsung gear fit 2 is an another Mid Budget Smart watch . It comes into 3 color blue, pink and black. You can Track your step count, calories burned, heart rate, sleep Quality and More by this device.It is good for daily uses. If your bidget is around 80-100$ then you can go for it.

Features:

512 RAM
4 gb Storage
1.5” Touch Curved AMOLED Display
3-4 Days Battery Backup
Receive and respond to notifications, calls and texts right on your wrist.
Bluetooth v4.2
GPS, Glonass
1.5" curved amoled Display
28 gms Weight
24h Tracker
Built In heart rate Sensor
Gorilla glass 3

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5 . Mi Band 2 : If you are searching for a low budget smartwatch which will can give you a great user experience. Then Mi Band 2 is for you. It is the best smartwacth in 25-35$ budget. You will get some great feature.

Features: