Very simple question: Which do you like more? Super Sentai or Power Rangers?
Personally, I'd go with Power Rangers. Not because I think it's a better show, but because of how Power Rangers makes me feel. Outside of Godzilla, Power Rangers is my ultimate nostalgia. I loved watching Power Rangers when I was a kid, and I still enjoy watching bits and pieces of the show nowadays. I don't have those same feelings for Super Sentai.
Now, I do understand that without Super Sentai, there wouldn't have been any Power Rangers. But, I'm a firm believer that a show/movie/whatever has the right to stand on it's own merits, without being compared to anything else, and that includes Power Rangers. And honestly, the creators of Power Rangers do attempt to make their own show, instead of a copy of Super Sentai. Wether the differences be in footage, characters, fights, music, etc., there are enough difference between the two shows to make them feel different from one another.
So yeah, Power Rangers may not be dark or have complex characters like some seasons of Super Sentai, but I would still take the "Green With Evil" 5-parter from Mighty Morphin' over anything that Super Sentai has to offer.