Depends on your development style and aims. One file is easy to add into a project, and the compiler optimizes translation units better, so you get a bit of a

Depends on your development style and aims. One file is easy to add into a project, and the compiler optimizes translation units better, so you get a bit of a performance increase in some cases. Having "Find symbol in file" is nice too if you know you are looking for it just in this one file related to the code. Most editors aren't as ergonomic for finding "symbol in current directory" as they are for "symbol in current file".