@Radagast i am surprised you don't like the sienna, its a hybrid and has AWD, Consumer reports has the carnival and sienna as the top buys.
one thing that led us to an odyssey over the pacifica a few years ago was the Pacifica didnt have a spare or a full size spare. we had an issue with a flat on a cross country trip a while back and DW said never again.
If I ranked by just how good the vehicles are (excluding reliability, fuel economy, and cost) I would rank:
1 Regular Pacifica. As good as any of the others, but the stowable seats put it over the top
2 Odyssey, not as many whiz bang features as a Carnival, but better thought out, and best turning radius
3 Carnival, nicer but not as well sorted as the Odyssey, acts like a bigger vehicle than it should
4 Pacifica Hybrid loses a few options, especially configurable seats
5 Sienna Really just doesn't do anything well except AWD, and easily the least pleasant to be in.
Ranking by cost/reliability/resale value:
1. Pacifica Hybrid. The tax credit and electric range easily put it over the top.
2. Sienna head and shoulders above the rest, except it doesn't have the PHEV advantages
3. Carnival, average, low price, great warranty, but bad fuel economy and not even AWD to show for it
4. Odyssey doesn't do anything bad, but nothing great either.
5. Pacifica expensive, poor resale, fuel economy average or worst (AWD), not especially reliable
Basically the lists are just reversed, except the Sienna and Pac Hybrid, which moves those models to the bottom and top of my value rankings, respectively. Whoever designed the Carnival had different priorities than me, so I'd stay away. The Odyssey and standard Pacifica are tied for second.
Lack of spare tire is concerning.