Actually the pacifica is also extremely popular in the frum circles so it's no longer just the sienna and odysees.
I once asked a very busy mechanic on his experience with used minivans, he told me that sienna will have the longest life, a lot of people driving at 250k miles with no issues, odysse is a decent runner up, and the pacifica is the car he makes his parnasah from.. total piece of garbage beyond the first 30-50k miles, only a good option for a lease. He told me to stay away from a used pacifica. I didn't ask him on the sedona as it wasn't relevant at the time.
Prices for used siennas and even odysses are indeed through the roof now.
(And as a btw, speaking of minivans, the 2020 Sienna looks extremely appealing, especially the driver's seat setting and sidebars which is like a SUV and no longer the typical uncomfortable minivan seats. Not on the market yet)