I third Zyuohger because it's better to watch the series sooner rather than later. Once you see the outstanding series, Zyuohger will be hard to sit through

For me, Toqger and Shinkenger can be a good recommendation. Toqger knows really well how to get funny and serious. Not to mention, it's 3rd to 4th quarter is strong, especially the end game. Shinkenger is much like Ninninger but being done better; WAY much better. No loud Red Ranger, good villains, Genta is pretty funny and enjoyable and so many more. Magiranger can be good too but I know it from reading materials.

Shinkenger was awesome in my opinion. The actors were great choices whether their acting was good or bad at the time, to which I thought was adequate, the whole lore was fun and they managed to craft this techno-edo period look for the suits and tech which was cool. And although the majority of Doukoku was being buzzed and get angry at his minions for losing he was menacing. Most of all the transformation and role call was just ON POINT. I loved how they had the backdrops and mob of kurokos on stand-by like it was a kabuki show.

Judging from what you have seen already. I'm voting for gokaiger and kyoryuger. You might get interest in older Sentai if you watch Gokaiger.