My wifi box is central in the house with 30 mbps the home office is 15ft away with one brick wall between the router getting 23 mbps. I need a wired connection for more secure wifi, both the TP-Link TL-WA850RE Wifi Extender and TP-Link TL-WPA4220KIT Powerline adaptor have ethernet ports so what difference do they offer?

Would really apprieciate the advice, I have been trying to research this previously but cant wrap my head around it.

Thanks