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What Is The Difference Between Garmin Gps Etrex Venture Cx & Legend Cx?

Those two models are discontinued. I suggest looking at the Venture HC and Legend HCx. They have a higher-sensitivity receiver and are easier to find in the marketplace.
The main difference between the Venture HC and Legend HCx is that the Legend has a microSD slot that allows you to store more map data and the Legend provides turn-by-turn directions. The Venture has no memory slot (but does have 24MB built-in memory) and does not provide turn-by-turn directions. The Venture has 14 hours battery life versus 25. The Legend can store more waypoints and tracks and allows you to create Custom POIs using Garmin’s POI Loader program. The Venture does not allow this.