a season in particular that you would say is the "best" for that show?

I don't remember, lol. That's why it's fun to watch again. Alas, I remember the main twists of the plot so the general storytelling line can't surprise me.

I am rewatching for the first time after 10 years or so, and I expected Season 1 to be quite bad (I remembered the beginning wasn't impressive). But actually no, even the quality of the image is quite high - the cameraman tried to make scenes look cinematic.

If you don't remember or don't know the general story, don't judge the show after Season 1 and even Season 2 - the Winchester brothers start as guys who simply hunt ghosts but each Season opens up new things - I am watching Season 4 now, and both brothers got really transformed (don't want to spoil), and they discovered a lot about the world of supernatural - and much more is ahead.

I remember at some point the show becomes overloaded with fiction.... Season 12 or 13, not sure - things become too absurd. Before that, it's super intriguing imo. And one of the strongest sides: they have amazing bright characters apart from the brothers - not from the very beginning, they appear slowly in different seasons. Many years later, I still remember some of them and love them. House of Dragons, you said? I remember they have many blonde characters - only this, lol.

The worst part of Supernatural: they have episodes that give nothing to the general storyline - like, a Halloween story and New Year Eve horror - often ridiculous, often you feel they really tried to engage teenagers below 16, so some episodes can be childish. I just skip some of them.