Mobil1 and Amsoil almost the exact same, not so sure.
Redline is a Polyolester based oil and great in super hard running apps and decent on the street once cleaned out. But not as long lived on street engines as Amsoil.
I have seen numerous reports of Amsoil thickening out of grade instead of shearing out of grade lower where Mobil1 does not so they are not the same.
Recent examples do not seem to thicken as much.
All are good.