I have only compared Claude Code with Crush and a tool of my own design. In my experience, Claude code is optimized for giant codebases and long tasks. It loves launching dozens of agents in parallel. So it's a bit heavy for smaller, surgical stuff, though it works decent for that too.

If you mostly have small codebases that fit in context, or make many small changes interactively, it's not really great for that (though it can handle it too). It'll just be spending most of its time poking around the codebase, when the whole thing should have just been loaded... (Too bad there's no small repo mode. I made startup hook that just dumps cat dir into context, but yeah, should be a toggle.)