Basically, I have an extender for the garden but whenever I go to the garden, my phone remains connected to the extender when I'm back in the house and I can always tell because everything is always slower to load when connecting through it.
How can I make my devices strongly prefer to connect to one SSID when both are there?
If the same SSID, it should automatically swap to the highest connection strength AP
Unfortunately, that is not part of any WiFi protocol standards. Never has been. It would be amazing if it were.
A few solution providers have bolted on their own proprietary junk to WiFi standards to kinda make this work, but it's generally expensive and still not flawless.