I'm thinking about switching my L-shaped desk for a rectangular one, but since I can't try before actually buying the desk, I'd like to know what other people think about the matter.

Is it simply a matter of preference? What are the pros and cons of each type of desk?

Also, I'm guessing a rather deep desk is necessary (I was thinking over 70cm/27'').

Btw, I'm aware of this question, but it doesn't talk about this specific point.

Same question on StackOverflow for anyone interested in an answer.