[Sunred]

As for myself, I choose Liveman. This show... this show folks, was the LAST Showa Era Super Sentai. And at the time because Goranger and JAKQ were not yet considered part of Super Sentai yet, this was technically the 10th anniversary show for the franchise. Okay, so it was an anniversary show and the last of its era, what else? Allow me to focus your attention to Exhibit A:

I have said it before and I will say it again. BEST. SETUP. EVER.
"Friends, why did you sell your souls to the devil?"
This one line from the narrator sums up the show perfectly. And episodes 1 and 2 are easily the best two-parter episodes that starts the show off neatly. What they mean by sell their soul is that three of their classmates have joined the villain faction of the show VOLT, lead by Great Professor Bias(pronounced Bee-ahs) and also killed two of the Liveman's friends just before ditching the school to be the lieutenants of VOLT. And from there, the Liveman team and VOLT's lieutenants constantly clash and further drama ensues.
Also it was a show with notable firsts:

1. First female blue ranger

2. First time a black ranger and green ranger are in the same show(until this show it would go back and forth)

3. First time two robots combined to form a super unit

4. First time the robots were animal-based(while technically Sun Vulcan was the first animal motif sentai, their robot was not)

And great toku alumnis galore! It's got Jiro/Kikaider from Kikaider as their principal, Jin Matoba and Gara from Dairanger as the lieutenants. The show also has Ryu Tenkuuji aka Takeru/Kamen Rider Ghost's father from Kamen Rider Ghost as the yellow ranger, and Rosyuo from Kamen Rider Gaim as an actor playing the role of evil genius villain group boss. One observation I would like to add is that Hurricanger heavily borrowed from this show, especially the motifs, their school being bumrushed by the villains at the start of the show, and the addition of two more rangers whose motifs are horned animals(Liveman having bison and rhinoceros-themed rangers, Hurricanger having a rhinoceros beetle and stag beetle).
While most of those who know this show like it as far as I am aware, being an old show it unfortunately tends to be forgotten unless someone brings it up, so, yeah folks. This show is worth it.