Posting flyers or door hangers more effective?

I made a handwritten note, not fancy design, simple, modern, and photocopied it, added my logo and a qr code with cta on the back. Thought it might stand out since everyone uses colorful designs, etc. Dropped off about 100 of them only at houses with pools by checking on google maps. Only one person has scanned the qr code, no one has called. I dropped them off on a sunday morning, figured everyone will be at home, chilling. I'm going for round two soon, round one was a failure.