I agree with @Rocodamelshekima, for homey I don’t think it matters.
You need to decide what works best for your use…
For simple cases zone activity works the same as timers.
But timers are much more configurable (and the app store hase many timer apps… (Search for timer in the app store)
Just switching one light using one motion sensor? Zone activity will work fine
Multiple motion sensors switching one ligt, zone activity is easier
If you have many lights in one zone and you want them all to switch on and off at the same time, zone activity is good.
If you want to switch them (Off) at different times Zone activity will Require you to split the flows
If you have motion sensors triggering lights in other zones, zone activity will be more complicated then timers
If you have triggers that homey does not recognize as zone activity it will not work (You smart dishwasher being opened is not recognized as activity?)
Example
I have lights on my driveway, And a motion sensor at the driveway (zone driveway).
And a few Lights on the garage wall
I have a second motion sensor in the garden (zone garden)
When I walk in the garden toward the garage only want the garage lights to go on.
When I drive onto the driveway the ligths (driveway and garage) turn on.
While unpacking my car the driveway sensor (that switched on the lights) is no longer triggered.
So that zo e activity will switch off turning off the lights
But I want to keep them on! Because the garden motion sensor is still being triggered.
Using zone activity makes it complex.
Managing the garage lights and driveway Lights with seperate timers it much easier (both sensors can reset the same timer)