thread author's favorite one is honestly the Americanized Dekaranger (SPD) That one was the one that really reeled me in, and after seeing clips of Tokusou Sentai Dekaranger, I plan to watch that when I can find all episodes and movies with english subs.
Based on what I remember from my childhood and from watching Gokaiger, I've chosen Megaranger as my next Sentai series. I've watched some Goseiger as well as Megaforce. I started to like Power Rangers more when they brought back Bulk and Skull in Samurai. I found like the lessons about staying active and being responsible were better than the focus on action and effects that the series seemed geared for during its time on Disney. I had become a casual observer by that point though, and some day I wanna watch everything having to do with Power Rangers.
I remember being fond of Power Rangers in Space as a kid, I had GalaxyMega and a number of figures. Space was a strange part of the story looking back on it, so Megaranger carrying its aesthetics with a high school plot is interesting to me right now.
I remember Mighty Morphin somewhat well, so I don't feel the need to go to Zyuranger yet, but I have wanted some episodes anyways out of curiosity. I know they are different but there is just a lot of Super Sentai, combined with the fact there is almost as many Power Rangers series.