A truly epic opening indeed!
There are so many really good ones, but tbh, it's hard choosing "best" or anything like that. The opening(first 15 minutes or so) of TLOU was one of the most jaw dropping things I had seen in a video game at the time, and possibly since...and I'm not even a huge fan of that series. It "felt" like the awe of playing Mario 64 for the first time, if that makes sense. It felt...next level for the medium.
Unless you mean, specifically, intro cutscenes, then I dunno.