Definitely test drive them in person...multiple times. And make a check list of pros and cons and what's most important to YOU each time you do test drive. I went into the whole thing *knowing* I wanted the Ody...and, well, that just all changed once I drove the Sienna.
The lack of armrests in the 2nd row was annoying, but it wasn't the dealbreaker. I could have easily overlooked that if the Ody won me over in others areas.
My comfort level with the brakes is HUGE for me because I live in the south and driving isn't really on the top 10 list of what southerners do best. I preferred the brakes on the Sienna. I also just felt...more in control. I'm a fairly petite person, so that's a big deal to me.
And because my oldest is 8 1/2 and in a HBB, the 3rd row and how much height there is to accomodate said booster was very important. And he's closer to 5-stepping in the Sienna 3rd row over the Ody.
The lack of extra LATCH is a non-issue for us since we'd only have booster riders in the 3rd row. But, for some people, yes, that's a legitimate reason to consider the Ody.
The other reason I went with the Sienna is the gas mileage. Unfortunately, I do A LOT of driving - and it's all really sucky city stop and go. The worst MPG I've gotten is 21...and that was after idling for 20 minutes due to an accident at an intersection (see above comment about southerners' lack of driving skills
). Considering I came from an '09 Grand Caravan, where I was getting 13-14 MPG on a good day, I am thrilled. Beyond thrilled.
I don't dislike the Ody...like codex said, these are great minivans. The Ody just didn't meet my requirements this time around. Maybe next time.