This should be a no-brainer in terms of what's more important to Tokusatsu. When I really think about it, I don't think I've ever seen a Toku where I really gave a **** about any of the poorly-written generic characters or the recycled storylines. What I usually find memorable is stuff like the action, costumes, villains, weapons/abilities, then story arcs last. Action and costumes are the big two.
If we narrowed down the genre to the Toku that have the most unique and innovative stories, there would be like three shows.