Speaking of myself, I prefer Cocotron over GNUStep . Cocotron is a standalone application, existing entirely in its own subdirectory in C: \ Program Files. It also looks and acts more like a native Windows application. The GNUStep application requires a full installation of the entire GNUStep environment and doesnβt mix well - it looks and acts just like what it is, a * nix application that runs on Windows. All in all, I think Cocotron provides the best end-user experience.
On the other hand, the GNUStep developer tools can run on Windows, while Cocotron requires the developer to work fully in Xcode and cross-compile to create a Windows binary (or other non-Mac). Regardless of whether it will be considered pro or con, it depends on how much you like Xcode.
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