TheMatrix Depends on your threat model.
If you are concerned about the Wi-Fi firmware maybe having a bad buffer-overrun vulnerability (or some other RCE), then having Wi-Fi off more often might be good.
Or if you're worried about somebody fingerprinting you by guessing your home AP SSID and confirming the guess if your phone tries to associate...
Personally I leave my Wi-Fi on. I'm sure others don't.
It might be good to write down a list of your concerns and non-concerns. Many countermeasures cost convenience/attention, so if a countermeasure protects against a threat you're not worried about, you might be wasting effort (which might be better spent on something else).