Not trying to start an argument, but my experience with Pandas, and what I read on websites like www.scotcat.com and www.planetcatfish.com,
is to the effect that Pandas prefer cooler temperatures than most other corydoras. Definitely don't want the tank over 78, and better around 75. I've never kept Pandas below 71, so perhaps you are right on that score. I've never had Peppereds, so I can't comment on their ability to tolerate low temperatures.
I've got about 25-30 pandas, after starting with six and having them reproduce pretty prolifically. I think they're great.
I was not saying that pandas like high tropical temps, more emphasizing that peppereds could work better if you have a cooler tank temp. Or, as noted above, if your power goes out.