Depends mostly on whether the powerline tech works at your place. When it works it is definitely waaaay less hassle, but if it doesn’t (or even worse, if it kinda works sometimes) then an ethernet cable is the way to go.
If it does work, it is bound to be more reliable than Wifi, especially further from your router. And going through walls a powerline is definitely better than a Wifi signal.
Let me put it this way: I have 7 Hikvision cameras mounted against the walls around my house, all running over POE. While it was a pain to pull the ethernet cables (Cat 6 FTP) it is super stable and super reliable, and the quality is great. And my Wifi congestion is much less.
BUT: I want to put another camera much closer to my pedestrian gate. I have a light there, so I have AC power, but the trunking runs underneath my paving and through my gate motor enclosure, so I really don’t want to run an ethernet cable through it as well. It is also further from my house, so Wifi could be a problem.
I specifically tested an EZVIZ camera at the spot with an extension lead, and the wifi will be ok, so I was willing to get one and install it with Wifi. But in replying to you I realised that AV Powerline ethernet could be an option and I’ll test it first before I end up buying the EZVIZ. I’m lucky enough to already have 2 units that I’m not using at the moment.
(Then again, the other Hikvision cameras in SA do not have speakers/mics, which I want for this spot, so I’ll probably end up buying the EZVIZ in any case).
Perhaps look at buying the Powerline ethernet units from Takealot, test it and if it doesn’t work, return it? Takealot is great in that regard, even if it is more expensive.