onerous, difficult or challenging to set all the calendar/moonphase functions. Each function is quickset by its own individual corrector. It is quick (pun intended) and easy.
All you have to know is when the most recent full moon occurred. And within a few minutes at most your are done.
On the other hand, if you have a 3448 or 2499, which does not have a corrector for the month, good luck on that one. That can be somewhat daunting, although definitely doable.
I guess it’s all a matter of perspective.
Anyway, 2 great watches. I go with idea that they make a great pair and if possible sell other watches to help fund the purchase of the 5970.
I look forward to reading what you decide to do.