pirate-luna answered: can’t you have both?
Well that’s a given. The tags under every post always are newest first, so I would have both if I had the sidebar links as oldest first.
The point of the question is whether people would prefer to easily browse in chronological order, particularly if they don’t know about the chrono trick to do it themselves.
i.e. Do you want the chrono feature enabled for the sidebar links by default or not?