Personally, I never liked AppCode. It was too much like Eclipse (which I also never liked).
Me not liking something, does not make it bad. It’s just not my choice. I’m glad it existed, because it probably prompted Apple to do better with Xcode. Lots of people that I respect, used it.
These days, Xcode is Big Bug Ranch. When “Delete the DerivedData folder” is S. O. P. for developers, and Apple tweaked Xcode to reduce its impact on the project, you know that they have waved a white flag to bugs.