The best Epson ink cartridge would be the most economical one. And the most economical one has the lowest cost per page. High yield ink cartridges have lower cost per page compared to standard cartridges. But the most economical one out of all would be Epson's EcoTank ink bottles which can print thousands of pages before needing to be replaced. EcoTank ink bottles offer the lowest cost per page out of all Epson ink making it the best consumer choice.