I am trying to prepare a POC using Sikuli. Can any one suggest me what is the best approach to use Sikuli for a windows based application ? Should I use Java with Eclipse or the Sikuli IDE itself?
Last time I've used Sikuli, I concluded the following: Sikuli IDE's one (and almost only) benefit was that it interpreted image paths as images allowing for a nicely looking code mixed with actual images. The IDE though missed a lot of features other IDEs offer from out of the box.
I don't really think there is much of a difference for a proof of concept. The IDE might be easier to set up. But the IDE would be limited if you decided to move forward using Sikuli. A full featured programming IDE, like Eclipse, or intellij, would give you the benefit of static code analysis, auto-completion, debugging capabilities, version control tools, plugins, dependency management, etc.
All of these would be desirable if you end up integrating Sikuli with other automation frameworks or libraries.
...for windows based application?
Sikuli was already mentioned. Just to add another option: For screenshot-based Windows desktop automation there is also SeeShell. Unlike Sikuli, it is not cross-platform, but optimized for Windows which brings a deeper platform integration. So if one only needs to work on Windows, it can be a good option.