Liveman turns 30 this year. Gingaman is 20. Go-onger is 10. So, out of these 3, which should get the Blu-ray treatment first? And don't feel like you gotta say Liveman just because it is the oldest. Anything goes.

Which sentai have the most realistic mechas ?

Liveman, really.
Gingaman was far too underwhelming, and Go-Onger never interested me.
I'd be down for some high quality Liveman episodes.

Go-Onger. While I'm primarily saying this because of my love for the show, its probably one of my favorite Sentai honestly, Go-Onger was almost certainly the biggest financial success of the three so it probably has a pretty fair chance of getting a Blu-ray based on that fact alone.

Probably GoRanger and JAQKA because they just have souped up vehigles and not giant robots.

Excluding those two, I'd say we should eliminate any series where the Mecha are explicitly mystical in origins or living beings. GoGoV gets points for the way the first robot assembled without anything suddenly being able to fly into the air, requiring the VTOL to lift blue and reds into place.

How would be your own anniversary season ?

Yeah, honestly I hope all three get Blu-Ray'd. The thing about these three are that each show has a ranger alum who went on to become stars in Japan's showbiz, specifically Kazuhiko Nishimura who played Joe Oohara/Yellow Lion(also Takeru/Ghost's dad in Ghost), Shoei who played Gouki/Ginga Blue, and Rina Aizawa who played Saki Royama/Go-on Yellow so the potential to have them promote their respective shows is there.

Zyuohger was based on Jumanji ?

The hell?

I don't know, it's sounds like a minecraft to me.