Sinai Or Oker Harim

 Rav Yosef was סיני [a בקי]. Rabbah was עוקר הרים [a חריף]. The Gemara [ברכות ס"ד] says that סיני is greater. 

So why do we almost always pasken like Rabbah [except in 3 cases] over Rav Yosef??