[scikaiju]

Let me see if i can explain this a bit

The Original and Makai senshi, both feature Kouga(he's been a knight for a while before the first season started, he became a Knight for the Senate when senshi starts) and company, but they have different story lines for each season. Although you might want to watch the original season to understand some of the backstory for a couple of characters.

Third series, takes place a bit way in the future, or an alternate dimension depending on who you ask. There's some debate, since most of the technology seems a bit more contemporary. It features different guy as Garo with a character named Ryuga. Now I personally enjoyed but some people find it off putting because it feels different than the previous 2.

Makai no Hana, features Raiga the son of Kouga. And he's not a carbon copy of him he has his own personality and quirks, although the butler Gonza still around.

the fifth season brings back Ryuga, and honestly is pretty much the most plot driven of the series so far, well consistently as far as the individual stories go. Although Ryuga does get a bit over shadowed by the main villain just in terms of personality.

There's also a sixth series that aired recently, makai retsuden. This is an anthology series that had stories that focused on various side characters in the Garo universe. So you might want to waiit on this one until you checked out a couple of the different season.

As for the best, well that's kind of hard to point out. Each season has it's own strength and weaknesses. For the first season there's an arc that starts when they introduced this one character is introduced and people say that made that season. on the flip side, both the third and fourth series had main characters that barely got any development if any. Seriously season three had had a team of three Makai Knights, and outside of Ryuga I don't even know the names of the other two outside of their Knight title, I kept referring to them as "Glasses" and "HLB".

My advice, finish Makai Senshi, is a good series I would recommend it as well. And then go back and watch the original series, it has a bit more of a horror vibe to it. and again you'll get some of the backstory for some characters. And them for the rest, maybe sample a couple of episodes to see if they're something to your liking.