Buy the Amazfit Bip 6.

It costs more because it actually does more, and the reviews back it up.

What was compared

KIPTUMTEK Smart Watch for Women Men, Fitness and Sleep Trackers with 1.83" HD Touchscreen,... — $17.99
Amazfit Bip 6 Smart Watch, 1.97" AMOLED Display, GPS, iOS/Android | 46mm, 14-Day Battery, ... — $79.00

1. Runs and hikes tracked without your phone
The Bip 6 has a built-in GPS chip that maps your route on its own. The KIPTUMTEK leans on your phone for location, so leave your phone home and your route data goes with it.
2. A screen you can actually read outdoors
The Bip 6's 1.97 inch AMOLED shows deep blacks and stays visible in direct sun. The KIPTUMTEK's smaller 1.83 inch display washes out outside and looks flat next to it.
3. Reviews that don't just call it 'OK'
Reviewers say the Bip 6 checks almost every box and is the best Bip yet. The KIPTUMTEK gets shrugged off as just OK from a brand nobody recognizes, with suspiciously high review counts.
4. 140 sports logged in detail, not just steps
The Bip 6 tracks 140+ workout modes with real per-sport metrics. The KIPTUMTEK only offers generic multi-sport modes wrapped around a basic pedometer, so serious training data is thin.
5. Yes it costs four times more. Buy it anyway.
The KIPTUMTEK is $17.99 against the Bip 6's $79.00. That gap buys a real GPS chip, an AMOLED screen and an app that gets supported. Unless you only want cheap step counting, that is what most people are actually paying for.