Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Acer - Swift 14 AI | Lenovo - Yoga 9i Gen 9 |
|---|---|---|
| Claimed battery life | 26 h | 15 h |
| CPU cores | 12 | 16 |
| Thunderbolt ports | 0 | 2 |
| Panel type | IPS | OLED |
| Weight | 1.32 kg | 1.36 kg |
Between the Swift 14 AI and Yoga 9i Gen 9, the Swift 14 AI comes out ahead in claimed battery life / weight, while the Yoga 9i Gen 9 wins on cpu cores / thunderbolt ports. Overall, the Swift 14 AI scores 68.6 and the Yoga 9i Gen 9 scores 69.5 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (68.6 vs 69.5). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the Swift 14 AI 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, weight. The single most decisive one: Claimed battery life — 73.33% more. 26 h vs 15 h.
Pick the Yoga 9i Gen 9 if you care most about cpu cores / thunderbolt ports. Its strongest claims are cpu cores, thunderbolt ports, panel type. The single most decisive one: CPU cores — 33.33% more. 16 vs 12.
Both ship with comparable ram, storage, battery, 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.
Which should you buy: Acer - Swift 14 AI or Lenovo - Yoga 9i Gen 9?
Lenovo - Yoga 9i Gen 9 leads the current Mars Score by 0.9 points.The more useful decision is the trade-off behind that result: compare weight against the way you will actually use the product.
Choose Acer - Swift 14 AI if…
Acer - Swift 14 AI has the measurable edge on claimed battery h, weight kg.
Choose Lenovo - Yoga 9i Gen 9 if…
Lenovo - Yoga 9i Gen 9 has the measurable edge on cpu cores, port thunderbolt count, panel type.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Acer - Swift 14 AI wins
- ▲Claimed battery life — 73.33% more. 26 h vs 15 h.
- ▲Weight — 0.04 kg less. 1.32 vs 1.36.
Why Lenovo - Yoga 9i Gen 9 wins
- ▲CPU cores — 33.33% more. 16 vs 12.
- ▲Thunderbolt ports — 2.00 more. 2 vs 0.
- ▲Panel type: OLED (vs IPS).
Spec comparison
Design
| Spec | Acer - Swift 14 AI | Lenovo - Yoga 9i Gen 9 |
|---|---|---|
| Weight | 1.32 kglead | 1.36 kg |
| Thickness | 15.9 mmlead | 16 mm |
| Build material | aluminum | aluminum |
| Backlit keyboard | true | true |
| Fingerprint reader | true | true |
Display
| Spec | Acer - Swift 14 AI | Lenovo - Yoga 9i Gen 9 |
|---|---|---|
| Screen size | 14 " | 14 " |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Panel typeⓘ | IPS | OLEDlead |
Performance
| Spec | Acer - Swift 14 AI | Lenovo - Yoga 9i Gen 9 |
|---|---|---|
| CPU | Snapdragon X Elite X1E-78-100 | Intel Core Ultra 7 155H |
| CPU cores | 12 | 16lead |
| GPUⓘ | Qualcomm Adreno | Intel Arc Graphics |
| RAMⓘ | 16 GB | 16 GB |
| Storageⓘ | 1024 GB | 1024 GB |
| Storage typeⓘ | SSD | SSD |
Battery & Ports
| Spec | Acer - Swift 14 AI | Lenovo - Yoga 9i Gen 9 |
|---|---|---|
| Batteryⓘ | 75 Wh | 75 Wh |
| Claimed battery life | 26 hlead | 15 h |
| USB-C portsⓘ | 2 | 2 |
| Thunderbolt portsⓘ | 0 | 2lead |
| HDMI | truelead | false |
Frequently asked
Which has better battery life, Swift 14 AI or Yoga 9i Gen 9?+
Swift 14 AI claims up to 26 hours — 26h vs 15h.
Which is lighter, Swift 14 AI or Yoga 9i Gen 9?+
Swift 14 AI is lighter at 1.32 kg vs 1.36 kg.
Which has an OLED display, Swift 14 AI or Yoga 9i Gen 9?+
Yoga 9i Gen 9 has an OLED display; Swift 14 AI uses IPS.