How to install feature based on the property set in custom action?

Question

I am trying to install one from two features based on the value that should be set inside of the custom action.
Firstly, I set the value of a property:

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Answer 1

Thank you for your replies. In the end, a combination of your suggestions helped me.

I want to state what did and what did not work:

1. Adding property to WiX with a default value was not necessary (as well with adding property of this property Secure='yes')
2. Calling custom action before CostInitialize did not solve the problem on its own, but I believe it was one of the factors that resolved an issue.
3. Conditional sintax was corrected by:
   a) Putting condition inside of CDATA and adding quotes to the value of property as suggested:
   b) Reversing condition levels so feature has condition level 1 and condition has level 0. This means that feature is always installed, unless the condition expression is false.