The best reason to own a minivan is for the sliding side doors, especially if you have to deal with little ones. NOTHING beats sliding side doors if you have little ones.
The best minivans by far are the Sienna and the Odyssey, as others have mentioned. The new Sienna Hybrids get 1/3 better gas mileage than the Odysseys, but are a little under-powered. If considering a used one, the 2020 and earlier Siennas still had a V/6 engine. Personally, if I were in the market and wanted a V/6 I would go with a used 2020 Sienna over a newer Odyssey because it will be more reliable, lower maintenance, and will last longer. The biggest problem with purchasing a new Sienna (besides the price) is the lack of availability. Toyota keeps upping Sienna production but there are still long waiting lists for the lower trim level models, and the higher trim level models are $$$$ (although the waiting lists are shorter), consequently nice low mile late model used Siennas are also hard to come by and $$$ (and way overpriced IMO).