Both printers include colour printing, Wi-Fi connectivity, and USB connectivity. Their most relevant distinctions are scan, copy, and fax and ISO black print speed.
L5390 offers print, scan, copy, and fax, versus print on ET-14100. ET-14100 has ISO black print speed of 15 ipm, versus 11 ipm on L5390. ET-14100 has maximum paper size of A3, versus A4 / Legal on L5390. L5390 supports an automatic document feeder (ADF), whereas ET-14100 does not. L5390 supports Ethernet, whereas ET-14100 does not.
The choice depends on use: L5390 leads in scan, copy, and fax, while ET-14100 leads in ISO black print speed. Match those differences to your needs. Consider the first model if scan, copy, and fax matters most; consider the second if ISO black print speed is the priority.