My lists so far, limiting it to only 3 series of each:
Super Sentai:
1.- Shinkenger.
2.- Gokaiger.
3.- Kirameiger.
Kamen Rider:
1.- Ex-Aid.
2.- Build.
3.- Gaim.
The first Rider I saw is Ryuki and the first series I saw live, was Gaim, so I am pre-disposed to like shows with multiple riders whose allegiances change along the way and that do not follow the 2 part stucture.
Ultraman:
1.- Ultraman Z
2.- Ultraman Nexus
And...that's it for Ultraman. I tried to watch Geed, it has pretty much everything I like in toku, but somehow never completed it while it was on Crunchyroll in LatAm, but I hope one day to finish it. Trigger is going great so far! I actually ordered a Sevenger sofubi a few days ago, since it was the chepaest Sevenger figure I could find.
Showa era stuff hasn't interested me for Rider or Sentai (tough I will admit I have seen very little of it), but what little I have seen of Ultra Q and Ultraman is very enjoyable. Kinda crazy to think both Ultraman and Batman 1966 existed at the same time. Both superhero shows, but very different approach.