I disagree with that not because I speak Sorani, because Sorani is an education language in school college books many other sources written with sorani dialect.

I am a Kurmanji speaker from north Kurdistan, Kurmanci is writing with Latin Alphabet and most of Kurds speak Kurmanji but not official language in Turkey and Iran. In Syria(Kurds have an otonomous,still not reconized) and Iraq

You had better learn sorani

hi kaia sorani is the official dialect in Iraq and Iran while kermanji is official in Turkey and Syria

I can recommend you kurmanci. Because main part of kurdish population speaks kurmanci. Of course sorani is important, because official language of Iraq's Kurdistan and half of Iran's Kurdistan speaks sorani. But you can use kurmanci all part of kurdistan (Turkey, Iran, Irak, Syria).