I'm replacing a regular 2 plug outlet with a Leviton Z-Wave Outlet [Instructions].
The old outlet had 2 screws for black, 2 screws for white wires going into it. This new outlet only has 1 screw for black and 1 for white.
Both of these seem like possibly correct wirings to me but I wanted to confirm and see if one was better:
Introduce a 3rd black pigtail wire, join the 3 blacks together with a wire nut, and only plug the 1 pigtail black wire into the outlet. Repeat for white (shown in picture).
Don't introduce a 3rd black wire, but rather insert the 2 black wires into the top/bottom slots of the same screw. Repeat for the 2 white wires on the other side.
It would be much easier to do (2) especially since space in the box is tight, however I was concerned since the instructions say "either hold may be used" (emphasis mine).
So my questions are: a) Are both of these valid options? b) Is one a "better" solution than the other?