Both printers include Wi-Fi connectivity and USB connectivity. Their most relevant distinctions are colour printing and scan and copy.
L3350 supports colour printing, whereas ET-M1120 does not. L3350 offers print, scan, and copy, versus print on ET-M1120. ET-M1120 has ISO black print speed of 15 ipm, versus 11 ipm on L3350. ET-M1120 has replacement black ink yield of 6000 pages, versus 4700 pages on L3350. ET-M1120 has standard paper input capacity of 150 sheets, versus 100 sheets on L3350.
The choice depends on use: L3350 leads in colour printing, while ET-M1120 leads in ISO black print speed. Match those differences to your needs. Consider the first model if colour printing matters most; consider the second if ISO black print speed is the priority.