If you read it correctly, the Mercury family has an easy to use Menu system, rechargeable batteries and are lightweight and small. If you ever tried to change the alarms in the plane, you know the advantage of a menu system instead of an App only model. The Crimson has 4+ Freefall alarms and canopy alarms. Also an optional app and both have the GEMINI technology where future altimeters can communicate over an encrypted bluetooth channel with each other.