The smaller one, and am very happy with the decision. The selling point on the EUV is really more rear legroom, but it has a more sloped hood to look sportier so you actually have less trunk space and a smaller opening unfortunately. It also gets less range by a bit, and has a longer hood so harder to park in a dense city if that’s a concern.
That being said, neither are fantastic road trip cars. I’ve taken it ~4 hours away, but you have to stop for about an hour on both outbound and return legs to comfortably make it and be able to drive around your destination. And I wish the trunk was ~1 inch longer or a bit flatter, you can only fit a normal rolling suitcase in the center, so it’s almost a 3-suitcase trunk with room on top but is actually only 2 without some significant Tetris.
This isn’t a young person problem and it isn’t new, it’s just getting worse. See Fox news on Trump 8 years ago or more through now