Epson - EcoTank ET-5850 vs HP - OfficeJet Pro 9135e

The EcoTank ET-5850 edges ahead on the Mars Score (60.4 vs 57.1), but the 3.3-point gap is small enough that the right pick comes down to which spec advantages matter to you.

Pick the EcoTank ET-5850 if you care most about pages/min (mono). The biggest gaps in its favor are pages/min (mono).

Pick the OfficeJet Pro 9135e if you care most about pages/min (color). Its strongest claims are pages/min (color).

Both ship with comparable type, color, auto duplex, so those specs don't 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 tells you both are well-rounded; the differences are about trade-offs, not quality.