Generally speaking, for internal planning purposes, I prefer "we" (i.e., "what do we need to do today?") since we're a team and working together. Even when reviewing each person's individual tasks, I prefer saying, "Jane will take databases" or similar vs. "Jane, you take databases".
For communicating with users, as either someone looking up instructions or someone writing instructions -- I realize this is kind of a weird stance, but I strongly prefer polite instructions because otherwise it feels rather presumptive to talk like we're friends and colleagues!
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