SINUMERIK vs FANUC vs HEIDENHAIN

Hello all. Im doing a homework research. I need to know whats the differences Sinumerik, Heidenhain and Fanuc systems. According to my research from forums I see experienced people(the majority) prefer Fanuc systems. But for less experienced part(not all) says its take more time and take more errors. Heidenhain is rare to use. I want to know what yours opinions is. Which one is better and why? What are the pros and cons of these systems. Thank you from now :)

Cam ödevini mi yapıyorsun sen de:D Ben de buralara düştüm

HEIDENHAIN System is the best.
Logbook entry -> only heidenhain
Entry of all information, keys pressed, alarms will show in logbook precisely.
Look ahead of 10000 blocks function

Regards
Senthil kumar
Akash Engineering