It's hard to say, but even Niaowu, the second city area, provides those huge city vibes on Hong Kong from Shenmue II, lots of buildings to enter, hundreds of shops and NPC's, secret pathways, hidden alleys, surrounding gardens, lakes as well as the vibrant street market and shopping areas. The game is huge and even the first Bailu Village area was massive which I didn't expect. There's so much to see and do. I knew Yu Suzuki said it was bigger than 2 but I wasn't sure what to expect but it feels bigger for sure. Nobody will be underwhelmed.
The second city area really provided those Shenmue vibes of being lost in a city and having so much to see and do. Lots of details and things to explore which I like.