For Litvish it's depth, predominantly in the Talmud.
For Chasidim it's breadth of the Talmud and other sources.
Do sephardim have their own unique style of Torah study?
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Wikipedia writes Rabbi Ovadia Yosef's opinion, that a wide knowledge of halacha is dominant over studying useless portions of gemara.
He emphasizes that the Sephardic system of learning, which emphasizes Bkiut (extensive familiarity with the Talmud, Mishna and Poskim), is superior to the Ashkenazi system which relies on deep analysis employing pilpul. This preference is based upon his support for ruling halakha on practical contemporary issues rather than ruling halakha as a purely theoretical pursuit.
Also, in Yalkut Yosef YD Siman 245 Seif 6, Yishak Yosef rules that someone who can only study for 2-3 hours a day should only study Halacha.
Furthermore, Rabbi Abadi has an answer on how to learn Torah, and he starts off by saying the most important thing to do is learn the halachot of everyday life, and only after obtaining a general knowledge of halacha, one should go on to learn Tanach, Mishnah, Gemara, peshat only. After you have an overview of the Torah, you should start learning more in depth, i.e. with perushim.