Dear @theGamer,

Both of the two switches are unmanaged switches, plug-and-play, no configuration supported and mainly used to expand the number of Ethernet ports.

The main difference between them is that the TL-SG1016D has a smaller dimension than the TL-SG1016, which is also suitable to be placed on a desktop for usage. Besides, TL-SG1016 V12 and later version support 802.1p/DSCP QoS (enabled by default) while SG1016D doesn't support it.

Generally speaking, if there are VoIP applications or other time-sensitive applications in your network, it's better to choose the SG1016 V12 or above version. Otherwise, you could select one from them as you like.

For more details about the two switches, you may follow the links below.

https://www.tp-link.com/business-networking/unmanaged-switch/tl-sg1016d/#specifications

https://www.tp-link.com/business-networking/unmanaged-switch/tl-sg1016/#specifications