The other place looked like it was for younger people and dancing. It's a club. This is a bar. Generally, in a club, there's more specialty mixed drinks. Bars have a lot of beers on tap and hard liquor. Also, you've got things like billiards and card games in a bar, where the focus for a club is a lot of bumping and grinding. It's the difference between socialization and sex, basically.
[ Doesn't seem all that ashamed to be telling the other as much. He assumes that Kaoru honestly doesn't know since he's a little young. ]