Let's assume that you are asked to mount a new panel next to an existing panel. I'd like your opinions on a few design issues:

1- Do you mount the smallest/cheapest panel you can, get one a little bit larger (for future growth, or do you try to match the physical size of the first panel?

2- Do you attempt to match the original brand of breaker, or do you install the brand YOU prefer?

3- If the new panel is a different size than the first one, how do you line them up? By the KO's you use to connect them? By the top or bottom edge? On center?