10/10 Thats all you need to know. You know what! 20/10!
So I recommend watching the first 5 KAI Episodes, then choose which World line you want to continue at. Choose from the ALPHA or the BETA. Or you could just watch them both. Doesn't really matter, or does it?!?!?!?!
BETA timeline is Steins;Gate 0
Dont remember if I included the movie, so......