Apple - MacBook Air 15 M4 vs Lenovo - ThinkPad X9 14 Gen 1

These two are nearly even on the Mars Score (63.3 vs 65). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.

Pick the MacBook Air 15 M4 if your top frustration with your current device is running out of charge before the day ends — endurance is the lead spec here. The biggest gaps in its favor are claimed battery life, cpu cores, battery, among others. The single most decisive one: Claimed battery life — 28.57% more. 18 h vs 14 h.

Pick the ThinkPad X9 14 Gen 1 if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. Its strongest claims are ram, storage, refresh rate, among others. The single most decisive one: RAM — 100.00% more. 32 GB vs 16 GB.

Both ship with comparable thunderbolt ports, backlit keyboard, so those specs do not separate the two — focus on the differences below.

Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.