Trains in Anime (and other random opinions)

Oh that's difficult. This list is going to have some recency bias:

Riginarazione. The show deliberately goes for some deeper topics this season, and the impending death of a grandparent is one of the biggest. And this episode deals with it beautifully.

El Toro de Piedra because I like the song a lot.

Mr. Agreste has some fun visuals and I love how it centres Adrien's perspective on Gabriel's legacy.

Other contenders:

Werepapas with its backstory and family focus is really cool, I just don't particularly love the akuma.

Vampigami is cute and I love the Rocky Horror references but it really should have been a musical.

The Ruler was really good.

The Chained Titans was really good for similar reasons as Riginarazione, I just wanted some more variety on the list.

Heartfixer suffers from the presence of the evil trio, who I don't love, but has some really beautiful scenes.

Daddycop was really fun with lots of competing storylines that worked well together.

The Dark Castle was a lot of time-travel fun but suffers from a completely unrelated and pointless akuma fight.

There is no one episode for the big lie plot, but I genuinely enjoy watching how Marinette makes herself suffer.