Compare Mobile Phones Side-by-Side

The Tecno Spark 50s is clearly the more usable phone for most people. Its larger 120Hz display should feel far smoother for scrolling and general use, and the 6GB of RAM gives it far more breathing room for multitasking than the Karbonn X21’s very limited 2GB setup. The 6500mAh battery is also a major advantage, especially if you want a phone that can comfortably last through heavy daily use.

The Karbonn X21 only really makes sense if you want something very basic, small, and likely inexpensive. Its 5.45-inch 60Hz screen and 3000mAh battery put it in a much more entry-level category, better suited to calls, messaging, and light use rather than media, apps, or long sessions away from a charger.

Unless price is the only priority, the Tecno Spark 50s is the much safer pick here.