The anime is better but being the original source of a 10/10 adaptation it's still obviously really fucking good. It helps that it has some content that the anime didn't touch, some of which is pretty good.

Amazing music, the SoL is probably one of my favourites in VNs as a whole and Tomoya is literally peak protagonist. Very well done emotional moments in general.

Obviously though the main highlight is After Story and is the main reason people love this one and well, yeah it is a sight to behold and absolutely deserves its reputation.