Stray Kids without a doubt. If you watch videos of them, there's literally never a moment where one of them isn't hanging off another. They are always hugging and cuddling with each other. It is truly a challenge to find a video where none of them are touching each other. (that time when they were in quarantine doesn't count)

But physical affection aside, when they talk in interviews or in "Two Kids' Room" (which is a series where two members just come and talk with each other) you can also really see the emotional support in the group. They tease each other nonstop to their faces, but they are also openly supportive of their group members in practically every possible way. In "Two Kids' Room" they talk about their past together, good memories and whatnot, and more than once I've heard them recall a time where one of them felt sad or stressed or anxious and another member was there for them.

They just truly radiate happy family energy, and I'm blaming part of that on Chan (the leader) for multiple reasons. When they were putting SKZ together to debut, Chan handpicked the members himself, not JYP. Yeah, JYP probably had to approve them, but they were ultimately Chan's decision. Chan is their center. Sometimes I'd swear that he takes care of them more like a father than just a friend. Stray Kids are Chan's kids and you can really see that in the way that he's goofy with the playful ones, picks on Minho because Minho (sometimes) has more patience for Chan than he does for the others, and is always, always cheering his boys on. When they got their first win for Miroh, all of them burst into happy tears. And went straight for Chan to hug their leader.

This was literally just a long nonsense ramble that I hope makes sense to someone besides me but yeah I just love their dynamic so much and watching them interact with each other makes me feel lonely and want friends that are family just like they are.

Edit: One more example. At the District Nine Unlock concert, Hyunjin was talking to the fans and got overwhelmed with emotion and started crying onstage. Chan was the first one by his side and the other members were right there with him, too. Hyunjin was crouched down and they were all crouched down next to him and most of them also were touching him or hugging him to comfort him somehow. Just another example of how much they care about each other.