[ocdtrekkie]

Definitely this. I use any time where I have to open a wall as an excuse to put Ethernet in it. Bathroom getting renovated? Great, use the opportunity to run Ethernet up to the second floor. Garage has a drywall puncture with moldy insulation behind it? Great, run Ethernet.

The upside here is adding Ethernet has been very low cost for me: Literally the cost of the cable and the keystones. Downside is I've been here like two years and my Ethernet runs are still somewhat random/piecemeal.

In one case, which has performed surprisingly well for basically the whole two years: I used an existing coax run with a pair of Motorola MoCA adapters, which provides a gigabit connection from my basement to a room that's particularly hard to retrofit a connection to.

Wi-Fi is for guests and smartphones. Ethernet is for life.