I'm about to start a B2C AI-based service but I'm not sure for which platform to launch it on. I'm a web dev and intuitively I would just build a web app and launch it there but a friend of mine (potential customer) is deeply convinced that a mobile app is the surefire way to go (otherwise I would miss A LOT of customers or a copycat would build a mobile app and catch em all). Could the difference be that big? In his opinion no one's using web apps for B2C stuff. I think it doesn't matter which platform I choose - IF the product is good and they want to use it, they will use the web app, too, but now I'm confused and unsure.

(Sorry for not providing more details on the product since the MVP is not done yet.)