Performance of BeanUtils vs. ReflectionToStringBuilder (for use in Bean classes)

I have a large number of Java bean classes in my web application, and I am trying to find a simple way to implement the toString() methods in these beans. The toString() method would be used for logging throughout the application, and should print the attribute-value pairs of all attributes in the bean.

I am trying out two alternatives:
1. BeanUtils.describe () (Apache commons-beanutils)
2. ReflectionToStringBuilder.toString() (Apache commons-lang)

Since this is a web application expected to have high traffic, the implementation has to be lightweight and should not impact performance. (Memory use, processor use, etc are main considerations).

I'd like to know which of these performs better according the criteria mentioned above. As far as I know, reflection is a heavy operation, but more details and insight into both these options would help me choose the optimal solution.