It's a difficult thing, really.

On a nice, saturday noon, just after finishing my meal, I'd love to go and explore a bigger dungeon with a few people. I am sated, have the rest of the day off and can spend a good amount of time puzzling and crawling around in a dungeon.
On a busy monday evening, I'd rather just rush through one in 20 minutes and be done. I don't have time nor nerves and want my tomes ASAP. If there's no trash on the way all the better.

A bit arbitrary examples, but you get the idea. It's not a fixed preference. What kind of dungeon I want to do depends on my mood and budget.