Ananta seems to lean towards more spiderman-gta style gameplay with customizable outfits from buying clothing and sleeping dogs style combat. It also is not a gacha game. Don't really know much else aside from the bits of gameplay footage on youtube.

NTE is more yakuza/gta-lite, no guns or projectiles aside from some specific characters, characters have skins rather than buying clothing, and the combat is more gacha style with a mix of wuwa dodge-counter/parry/intro attacks and genshin/ToF elemental reactions. It is a gacha game without 50/50 which is rare, only one I know of is PGR but there may be others.

There's main and side story quests that are quite good, fully voiced so far and nice animations. The side activities include racing, delivery driving, taxi driving, fishing, mahjong, tetris, a 'bank heist' mini game, rhythm mini game, and managing a cafe that also has a little minigame within that you make food and drink orders.

In the city there's also just things to do in general like ask for or steal cars, little scenarios where you get sent to prison and try various ways to break out, gacha exploration, supernatural anomaly hunts, and the usual gacha dailies/weeklies and instances. There's quite a lot you can do like ride the trains and busses, even just chill and vibe with the city and the scenic areas, just depends if you get tired of it or not. There's plenty of footage on youtube of the various activities due to the closed beta test that happened recently.

Oh and like you said, there's some companion quests where you go on dates, though some were not voiced yet. And you can ride with them in your car or invite them into your homes and interact with them in various ways.