C&D recently ranked the Chrysler Pacifica #1 in the category -- ie. over the Sienna and Odyssey:
https://www.caranddriver.com/compari...omparison-test
Obviously, I doubt they have considered long term reliablity as a ranking criteria, and you can't do anything to convince me that a Chrysler product will be more reliable than a Toyota / Honda vehicle in the same segment. But I suppose it can't hurt to at least consider the Pacifica as a potential purchase.
Also, when used Sienna and Odyssey are holding up value so well, why not consider purchasing a new one instead?