Both printers include colour printing, Wi-Fi connectivity, and USB connectivity. Their most relevant distinctions are scan and copy and ISO black print speed.
L3360 offers print, scan, and copy, versus print on L18050. L3360 has ISO black print speed of 11 ipm, versus 8 ipm on L18050. L18050 has ISO colour print speed of 8 ipm, versus 6 ipm on L3360. L18050 has maximum paper size of A3+, versus A4 / Legal on L3360. L3360 has replacement black ink yield of 4700 pages, versus 3600 pages on L18050.
The choice depends on use: L3360 leads in scan and copy, while L18050 leads in ISO colour print speed. Match those differences to your needs. Consider the first model if scan and copy matters most; consider the second if ISO colour print speed is the priority.