Israel has very good intelligence on the ground in Gaza. That is how they are able to hit cars containing terrorists with only minimal collateral damage to others.
The West Bank network is better. Israel has many Arab Jews who have ancestry in Iraq and other Arab nations. They speak Arabic and look fairly Arab. Darker skin etc than European derived Israelis. Also some shared genetics with Arabs due to living among them for centuries. Traditionally when a Jewish woman is raped by a non-Jew this baby is kept and brought up as Jew. They make good spies. But used much more often (my opinion) are paid Palestinian informants. Used in Gaza and the West Bank
Israel has disengaged from Gaza unlike the West Bank. So Gaza spy-ops are not as good as West bank