The L6390 and Smart Tank 210 share colour printing, Wi-Fi and Wi-Fi Direct, borderless printing. Their confirmed differences are set out below. These shared entries establish a common baseline and do not, by themselves, favour either model. The specific differences below can guide your choice by need.
L6390 supports an automatic document feeder; Smart Tank 210 explicitly does not; L6390 supports automatic duplex printing; Smart Tank 210 explicitly does not; L6390 supports Ethernet connectivity; Smart Tank 210 explicitly does not; Replacement colour ink yield is listed at 8000 versus 6500 pages for Smart Tank 210 and L6390; Smart Tank 210 additionally lists Android, ChromeOS, iOS in supported operating systems, beyond L6390.
The L6390 may suit a need for feeding multiple pages for scanning, while the Smart Tank 210 may suit someone prioritising higher stated replacement-colour yield. Consider the actual functions, throughput, and paper format required. An entry supplied for just one model is insufficient to conclude that the other lacks the feature.