Is it better to watch the classic series in production code order rather than air date order? I did it accidentally and the beginning of the serial mentioned something from the last serial I'd seen, but by air date it hadn't even happened yet. Not that it's much of big deal, I'm watching the third and fourth Doctors concurrently anyway.

I'll likely get into the audio adventures as well, but I'm kind of overwhelmed by the volume of material in the Whoniverse. I'm already familiar with Pertwee and Tom Baker which is why I started there, but I'm not sure whether to keep going with the fifth Doctor or check out the first two next. Any suggestions appreciated!