Follow the hub (actual term is calculation method) that the people around you in your area follow. Only difference in prayer time for the madhhabs is ‘Asr (Hanafi v. Hanbali, Shafi’i, Maliki). Here are the hubs:
Muslim World Leauge (18 degrees Fajr, 17 degrees Isha’): Europe, far east, parts of the US
Egyptian General Authority of Survey (19.5 degrees Fajr, 17.5 Isha’): Africa, Syria, Iraq, Lebanon, Malaysia, parts of the US
Islamic Society of North America (15 degrees both): Parts of the US, Canada, parts of the UK
University of Islamic Sciences, Karachi (18 degrees both): Pakistan, Bangladesh, India, Afghanistan, parts of Europe
Umm Al-Qura (19 degrees Fajr, 90 minutes after sunset Isha’): The Arabian Peninsula
Moreover, Imam Abu Hanifa’s view was that it should be 18 degrees both, but his disciples’ view was 18 degrees Fajr and 15 degrees Isha’ like the rest of the madhhabs (Shafi’i, Maliki, Hanbali). I suggest IslamicFinder which allows you to choose the Karachi hub (Abu Hanifa’s way) or the others’ way by customizing the degrees in the settings.
So, University of Islamic Sciencies, Karachi, if you are using Abu Hanifa’s view or customize the settings if you are a non-Hanafi (Abu Hanifa strict) person. You can also ask your mosque which calculation method they use, then use their timings or just use their hub. 1
EDIT: I decided to add also Jafari people do 16 degrees on both, Fajr and Isha’.