When stamps win
- Low price point (under $20 per visit).
- High frequency (customers visit weekly or more often).
- Clear "one transaction = one stamp" logic.
- Reward that is easy to explain ("every 10th coffee free").
When points win
- Higher price point (over $50 per purchase).
- Variable basket size.
- You want the amount spent to drive the reward.
- You run tiers (Bronze / Silver / Gold) where total spend matters.