Neither one. Which is ironic since I'm third gen Japanese American and grew up eating both, LOL. In my teens I OD'ed on toro and have never been interested in raw fish since. I have nothing against sashimi, I'll eat a piece or two when it's really fresh, but wouldn't bother ordering it for myself.
Ironically, my Hong Kong-born DH, who never had raw fish growing up, loved it the moment I introduced him to it. He adores sashimi, particularly hamachi.
We're both so-so about sushi in general. I make it for my family when we do potluck get togethers, because I do it very well and they love the stuff. The only kind I really like are the futomaki, which is a major pain to make at home and thus ideal restaurant food; and inarizushi which I make at home. I was taught to mix the rice not only with the sugared vinegar, but for inarizushi, to add diced shiitake mushrooms and carrots, as well as petit pois. Colorful and delicious!
I also make a custom sushi that everybody loves. An egg crepe, folded into quarters, containing some sushi rice, slices of lox, and goma wakame (sesame seaweed salad) for a little crunchiness. Something of a pain to make - not difficult, just numerous steps over a few days.
We're purists. Don't care for the new-style "wet" rolls that are covered in sugary sauces. Very simple, very fresh, and we're trying hard to get away from non-sustainable fish. Happy to see more local restaurants, all cuisines, following the Monterey Bay Aquarium Sea Watch lists. Was at a lovely little Peruvian restaurant in our downtown last week that does crudo as well as ceviche. They used a local bass for their crudo and it was amazing - so sweet and delicious.