Batman Beyond - Correct viewing order?

[THGhost]

What order do you prefer to watch this series in? Or cartoons in general? By air date or by production order?

I've been watching Batman Beyond by air date and haven't really noticed anything wrong until early on in season 2; characters having already met, stuff like that.
You can view the show's air dates and production orders HERE.

The Wikia says that "Countdown" is the last episode of season 3 in production order, but still says that "Unmasked" is the series finale even though it puts it as episode 8 in production order.

The air dates are the order in which the episodes appear on the DVD releases.

So basically, I'm a little confused. Which order should I go with? I hate when this happens. One of the worst cases is probably X-Men: The Animated Series. The viewing order for that show is an absolute mess.