Been into Tokusatsu for years, but skipped Ultraman, time to fix that

Hey guys, how’s it going? I’ve always been really into Tokusatsu since I was a kid. I’ve been following Super Sentai, Kamen Rider, and Godzilla for a long time, but Ultraman never really caught my interest.

Anyway, I wanna fix this flaw of mine and start watching the franchise. Which series would you recommend?