Honestly, I think this as well. It was such an incredible episode. It was also the first episode in like 2 seasons that had a song I actually liked, and the first episode of MLP I've ever watched in my 5 years of being on this fucking ride that literally made me cry. Hell of an accomplishment, that.
Prior to this, I would have said Return of Harmony or Party of One were my favourite episodes.
But Crusaders went above and beyond my expectations.