This study compares occupant satisfaction in WELL-certified and LEED-certified buildings using a statistical matching approach. It analyzed 1634 occupant surveys from 44 LEED-certified buildings and 1634 surveys from WELL-certified buildings, matching six architectural and experiential parameters. Overall building and workspace satisfaction was high in both certification systems, with 94% and 87% satisfaction in WELL-certified buildings and 73% and 71% in LEED-certified buildings. The study found a 39% higher probability of finding occupants more satisfied in WELL-certified buildings compared to LEED-certified ones, indicating higher occupant satisfaction in WELL-certified buildings. However, the exact reasons for this difference were not identified. The study also found that perceived indoor environmental quality was enhanced across all parameters except for the amount of space. The results suggest that WELL certification may lead to higher occupant satisfaction due to its focus on human health, comfort, and well-being, while LEED certification focuses more on sustainability and energy performance. The study highlights the importance of considering both certification systems and their unique focuses when evaluating building performance. The findings indicate that WELL-certified buildings may offer better indoor environmental quality and occupant satisfaction, but further research is needed to understand the underlying factors contributing to these differences. The study also notes that the age of the building and other personal factors may influence occupant satisfaction, but these were not controlled for in the analysis. The study concludes that while both certification systems have their strengths, WELL certification may provide a more holistic approach to improving occupant satisfaction and indoor environmental quality.This study compares occupant satisfaction in WELL-certified and LEED-certified buildings using a statistical matching approach. It analyzed 1634 occupant surveys from 44 LEED-certified buildings and 1634 surveys from WELL-certified buildings, matching six architectural and experiential parameters. Overall building and workspace satisfaction was high in both certification systems, with 94% and 87% satisfaction in WELL-certified buildings and 73% and 71% in LEED-certified buildings. The study found a 39% higher probability of finding occupants more satisfied in WELL-certified buildings compared to LEED-certified ones, indicating higher occupant satisfaction in WELL-certified buildings. However, the exact reasons for this difference were not identified. The study also found that perceived indoor environmental quality was enhanced across all parameters except for the amount of space. The results suggest that WELL certification may lead to higher occupant satisfaction due to its focus on human health, comfort, and well-being, while LEED certification focuses more on sustainability and energy performance. The study highlights the importance of considering both certification systems and their unique focuses when evaluating building performance. The findings indicate that WELL-certified buildings may offer better indoor environmental quality and occupant satisfaction, but further research is needed to understand the underlying factors contributing to these differences. The study also notes that the age of the building and other personal factors may influence occupant satisfaction, but these were not controlled for in the analysis. The study concludes that while both certification systems have their strengths, WELL certification may provide a more holistic approach to improving occupant satisfaction and indoor environmental quality.