When comparing Lean FT vs Geb, the Slant community recommends Geb for most people. In the question“What are the best test automation tools for web apps?” Geb is ranked 15th while Lean FT is ranked 20th. The most important reason people chose Geb is:
It's very easy to integrate Geb with any build system.
Ranked in these QuestionsQuestion Ranking
Pros
Pro It helps move testing closer to the development cycle
It's very easy to go between UFT and LeanFT. Whoever is used with UFT can easily become very productive with LeanFT too, but with the added benefit of moving the testing closer to the development cycle.
Pro Easy integration with build systems
It's very easy to integrate Geb with any build system.
Pro Asynchronous requests testing is a easier
Asynchronous web pages can easily be tested with Geb as it has built in, easy to use support for testing such operations.
Cons
Con May have some stability issues
Since it's still a (relatively) new product, it may very well have some stability issues, which are sure to be fixed in the future though.
Con Low IDE support
There are not many IDEs that support Geb.