Today, Apple's Series 3 GPS + Cellular Watch is on sale for $199 at Walmart. The smart watch tracks heart rate, calories, steps and can receive texts, calls.

Exactly how does the Apple Watch Series 4 differ from Series 3 and which one should you choose? Here's all you need to know.

The Apple Watch Series 3 (38mm) Aluminum case GPS + Cellular is a smartwatch compatible with iOS and includes real-time heart-rate monitor, steps, sleep, and calories.

Those who want GPS, a faster processor, and more but don’t want cellular can get the new Apple Watch Series 3 for less than the Series 2 sold for.

All Apple Watch Series 3 models come with GPS, which can do things like track workouts or trigger alerts. However, only the GPS + Cellular Apple Watch Series 3 models can fully function without a ...

The Apple Watch Series 3 offers built-in cellular for data and even phone calls. It works remarkably well, but not without a cost -- in battery life and money.

The Apple Watch Series 4 with GPS is currently $50 off the original price. With a speaker that's 50% louder, an improved activity sensor and an aluminum case, this is a gift anyone would enjoy.

The Apple Watch Series 3 base model with GPS costs $330 which is a whopping $100 more than Fitbit’s Versa Special Edition. The Apple Watch with GPS and cellular costs $400 and is available on ...

Right now, Walmart is taking $80 off the Apple Watch Series 3 GPS, making the total price under $200. The Series 3 has GPS and all the smart-tracking capabilities you need.

Which Watch is which? Should you choose the Series 6, the Series 3 or this in-between model, the Apple Watch SE?