All my walls are solid brick, so it's a choice of cabling tacked to skirting boards, cabling under the floors or excavations. I'd pick powerline over those options.
All my walls are solid concrete. I recently had the house cabled up because the powerline stuff dropped multiple times a day for 5 minutes at a time. It was infuriating.
The cabling runs through the ceiling and dropped down to port height via electrical conduit on the external side of the wall. It was expensive but I would have paid more considering the quality of life improvement.
I spent a couple of hundred on a mesh wifi system and while it has two downsides (double nat, and a higher base latency of around 6ms instead of <1ms to the router) it's otherwise flawless. I have a small flat (500 sq ft) and it took 3 carefully positioned mesh points (within LOS of each other) but it works great.
