wired :
pros - maintenance free
cons - need to do wiring throughout the house..
- the wiring can get faulty .. possibly eaten by rat, or deterioriate itself
due to aging, or bad installation..
wireless
pros - no need wiring
- you change the sensor location anytime, anywhere. And maybe you
want to put the sensors on your cupboard or drawer if you like.. and maybe
stick it at your front gate if the sensor can withstand outdoor condition.
cons - need to change battery periodically..
- if the sensor is put on the roof, you need to climb your roof to change the battery.
As for me, if money not a problem, i'd go for wired, or maybe get both, so I can get
the advantages of both world.
Proper wire system will not expose too much wire. It risk being tamper by thief. Usually all are conceal and only the connection to the sensor are expose "minimal"