Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Epson - EcoTank ET-2850 | HP - OfficeJet Pro 9135e |
|---|---|---|
| Pages/min (color) | 5 | 18 |
| Pages/min (mono) | 10.5 | 22 |
| ADF | false | true |
Between the EcoTank ET-2850 and OfficeJet Pro 9135e, the EcoTank ET-2850 comes out ahead in several specs, while the OfficeJet Pro 9135e wins on pages/min (color) / pages/min (mono). Overall, the EcoTank ET-2850 scores 63.4 and the OfficeJet Pro 9135e scores 71.2 on our Mars Score.
Which should you buy?
The OfficeJet Pro 9135e edges ahead on the Mars Score (63.4 vs 71.2), but the 7.8-point gap is small enough that the right pick comes down to which spec advantages matter to you.
The EcoTank ET-2850 does not pull ahead on any single popular-comparison spec — its strengths sit in the spec-table groups rather than the headline advantages.
Pick the OfficeJet Pro 9135e if you care most about pages/min (color) / pages/min (mono). Its strongest claims are pages/min (color), pages/min (mono), adf. The single most decisive one: Pages/min (color) — 260.00% more. 18 vs 5.
Both ship with comparable type, color, auto duplex, so those specs do not separate the two — focus on the differences below.
Bottom line: the OfficeJet Pro 9135e is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: Epson - EcoTank ET-2850 or HP - OfficeJet Pro 9135e?
HP - OfficeJet Pro 9135e leads the current Mars Score by 7.8 points.The more useful decision is the trade-off behind that result: compare pages/min (mono), pages/min (color) against the way you will actually use the product.
Choose Epson - EcoTank ET-2850 if…
Epson - EcoTank ET-2850 does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
Choose HP - OfficeJet Pro 9135e if…
HP - OfficeJet Pro 9135e has the measurable edge on ppm color, ppm mono, has adf.
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 Epson - EcoTank ET-2850 wins
- No decisive advantages.
Why HP - OfficeJet Pro 9135e wins
- ▲Pages/min (color) — 260.00% more. 18 vs 5.
- ▲Pages/min (mono) — 109.52% more. 22 vs 10.5.
- ▲Has ADF.
Spec comparison
Spec
| Spec | Epson - EcoTank ET-2850 | HP - OfficeJet Pro 9135e |
|---|---|---|
| Type | Inkjet AIO | Inkjet AIO |
| Color | true | true |
| Pages/min (mono) | 10.5 | 22lead |
| Pages/min (color) | 5 | 18lead |
| Resolution | 5760x1440 dpi | 4800x1200 dpi |
| Max paper size | Letter | Letter |
Features
| Spec | Epson - EcoTank ET-2850 | HP - OfficeJet Pro 9135e |
|---|---|---|
| Auto duplex | true | true |
| ADF | false | truelead |
| Wi-Fiⓘ | true | true |
| AirPrint | true | true |