It really doesn't matter as long as you pick one and stick to it. A coding standard is like a dialect, and as long as everyone on the team speaks the same dialect, you're fine.
That said, why not pick the same standard as your runtime library (VCL) and documentation use? Then you will all be speaking the same dialect and you will have an easier time reading the runtime library code. And there are plenty of code examples to illustrate coding conventions.
