Slow burn. Always. Bonus points for enemies-to-lovers.
Maybe it's because I've been a fan of Jane Austen for years, especially Pride and Prejudice (even though I don't really like romance novels and hardly ever read them).
Of course, everything within reason. I liked Tokimeki Memorial Girl's Side, but seriously, you date a guy for like 3 years just to FINALLY get a short kissing scene at the end. That's too slow even for me ;).