"The 38 cubic feet space in my wife's 2012 Odyssey can fit a stack of 3-4 large suitcases. The bulk of the space is actually below the floor of the van which is highly practical. The Traverse's extra length is all in the nose, which just becomes more annoying when parking. Odyssey also has a very tight turning radius. I rented a Traverse for a family road trip through the mountains last year. Nice vehicle, just doesn't match a minivan in practicality."
All that is true. The deep well in the back of a minivan is a huge selling point. Also has a lower load height which makes it easy on your back. I can hide an entire Costco trip's worth of stuff in the well. I also rented a 2015 Traverse in Hawaii and it rode very nicely and quietly and had a decent sound system for a mid trim LT. Didn't handle or brake as well as my Odyssey, got 16 MPG (my 15-year-old larger Odyssey gets 18 MPG), third row was tight, couldn't fit much in the trunk, and it was a pain to park. The Traverse is longer, but that's a bad thing. It fits less inside and it's larger. A cockroach also crawled out of the air vent, but that's a different story:)
My 2016 Prius Four has 27.4 cu.ft of space behind the rear seats. It's pretty big. That's 4 more cu.ft than what is behind the 3rd row of the 2017 Traverse.
The 2011-2017 Odyssey can hold 38 cu.ft behind the third row. The Traverse holds 24 cu.ft. More importantly, the Odyssey has 93.1 cu.ft behind the 2nd row. The Traverse has 70.3 cu.ft. A big reason for that is because the 3rd row in the Odyssey folds into the cargo well. Then you have a flat load floor.
Again, you can't argue against a minivan. It's the most practical car there is.