Which is better for companies to spend money on, advertising online or advertising in public places?

I'd say online advertising is generally more effective for companies nowadays, mainly because it can be tailored to individual users' interests. For example, when I'm scrolling through social media in Shanghai, I often see ads for apps or products that match what I've been searching for recently. That kind of precision is hard to achieve with billboards or posters in public places, which might catch your eye but aren't always relevant. However, I think public ads still have value, especially for creating brand awareness in busy areas like metro stations or shopping streets. It's not about choosing one over the other, but rather finding the right balance based on the company's goals.