Triathalon offers more fabric choices, Intelligent Hembar Alignment, and a WIDR option for larger shades (up to 144x144"). It works with any system, including RA2 Select/RA3. Serena has limitations in fabrics and sizes, lacks Intelligent Hembar Alignment, and only pairs with standalone Picos and Caseta. The price difference between Serena and Triathalon is minimal. Choosing our Triathalon offering at Serena’s price point results in an "Free" upgrade.