It is better to update through the official Google Play Store. This ensures you have the legitimate 2.211 build that includes cloud saving, level downloading, and security updates.
If you don't want to pay but want a taste of the new 2.2/2.21 physics, download from the Play Store.
To "get better" at the current state of Geometry Dash, focus on mastering the new physics and mechanics introduced in the 2.2 era: Master the Swing Mode
The answer to this question ultimately depends on personal preferences. However, based on the features and gameplay mechanics, Geometry Dash 2.2.1 APK seems to offer a more comprehensive and engaging experience. Here's a comparison with other versions:
In the past, RobTop updated the free mobile version ( Geometry Dash Lite
If you log into your legitimate RobTop account (used to save progress on the official server), you risk a permanent ban. RobTop Games actively detects hacked clients, and your profile will be flagged as "Cheater," removing you from leaderboards.