As far as I have experienced, they are going to scan all hand bags looking for gold and "extra laptop" or "cell phone" (YMMV). The checked in bag is also scanned either before it hits the belt or before you exit customs hall. So there is really no difference between the airports you mention.

But if you are landing in a small airport which sees few international flights a day then the immigration and customs are like getting the third degree. Those airports are to be avoided.