Both printers include colour printing, USB connectivity, and borderless printing. Their most relevant distinctions are scan and copy and ISO black print speed.
DCP-T230 offers print, scan, and copy, versus print on ET-16150. ET-16150 has ISO black print speed of 25 ipm, versus 16 ipm on DCP-T230. ET-16150 has maximum paper size of A3+, versus A4 / Legal on DCP-T230. ET-16150 supports automatic duplex printing, whereas DCP-T230 does not. ET-16150 supports Ethernet, whereas DCP-T230 does not.
The paired specifications favour ET-16150, particularly on ISO black print speed. The other model may fit better if its own strengths matter more to you. Consider the first model if scan and copy matters most; consider the second if ISO black print speed is the priority.