If you're on a quest to find one game from every genre that you like, OP, then you should probably play more than one JRPG. Which of your options appeals to you in terms of themes or visual aesthetics? Did you check out any gameplay vids on Youtube? Read any professional or user reviews? That's the only way you're going to be able to narrow down the field to something that might really be worth your time. The spoiler risk strikes me as minimal when you consider how much time JRPGs usually require gamers to invest if they want to finish a given game.
Personally, I like main series Final Fantasy because it mixes up settings and gameplay with each new iteration. The Persona series is also creative, but I get tired of the Japanese school setting, so I don't play all of them. I've never had any interest in the other franchises you listed, but that doesn't mean that they're bad; I'm just not the right audience for them.
Do you like strategic combat and a (vaguely) WWII setting? What about Valkyria Chronicles? Do you really prefer fast action that only barely touches on JRPG tropes while tossing in nods to many other Japanese games? Try Nier. Want combat that isn't tied to a lengthy narrative or an anime aesthetic at all? Give Demon's Souls a shot. Like gunplay, steampunk aesthetics, and working out wild combat mechanics? Resonance of Fate might be something to check out.
Personally, I like main series Final Fantasy because it mixes up settings and gameplay with each new iteration. The Persona series is also creative, but I get tired of the Japanese school setting, so I don't play all of them. I've never had any interest in the other franchises you listed, but that doesn't mean that they're bad; I'm just not the right audience for them.
Do you like strategic combat and a (vaguely) WWII setting? What about Valkyria Chronicles? Do you really prefer fast action that only barely touches on JRPG tropes while tossing in nods to many other Japanese games? Try Nier. Want combat that isn't tied to a lengthy narrative or an anime aesthetic at all? Give Demon's Souls a shot. Like gunplay, steampunk aesthetics, and working out wild combat mechanics? Resonance of Fate might be something to check out.