The JP EraK isn't being worked on anymore? That's sad, it's my favorite. To be fair, I haven't played Megaton or TW because they don't really seem all that interesting to me. I considered getting into Megaton, I dunno why I haven't. I think because it was only like half translated last I checked.
I tried Megaten. I don't recommend it. Like playing a game from the 80s, with all the crust of one intact and modern complications. It ain't a very pretty or wield-ly gameplay experience. Pretty much only for the Megaten fans so diehard they could suffer through anything for the series.
It so much trouble and investment that it's just not fucking worth the payoff when TohoK and TohoTW have the same sex systems, but way more unique dialogue. If there's some character in EraMegaten you really, really, really want to bang that badly, you can just make them in TohoK via Custom Characters, anyway.
TW would be a lot better if more characters were just translated. The Japanese guy who wrote most of the translated ones seems to have a fetish for explicit mental disabilities and other such things. And he writes like someone with a mental disability. Like, nearly everyone at SDM is translated, but their scripts are so bad and OOC, they're pretty much unreadable.
Like "Mentally Insane, Tsundere" Tewi (Tewi gets three different scripts and they're all bad.) or then there's Flandre who doesn't so much act like a "Anime Loli" as much as she acts like a literal 5-year-old who can't spell her own name, yet.
Most of the best (Best as in amount of content + Writing quality) characters are untranslated. At least Akyuu, Kosuzu, and Suwako are translated. They're amongst the better ones in TW. (Though, they can't compare to the untranslated Alice, Kasen, Nazrin, Kogasa, Satori, or Koishi. Those six all have at least 1 MB of text to each of them. And most of that text is at least decent.)
If you try TW, I recommend starting in the Human Village and gunning for Akyuu, Kosuzu, or Suwako. There's definitely still lots of grind to TW, though.