I don't have experience with this, but I would say do both.
From direct, paid advertising (e.g. Instagram ads, FB ads), direct people directly to the app store download page. And from influencer marketing and social media marketing I'd direct them to a landing page.
My reason being is that with FB ads and such, a click on the ad signals strong intent to act. Thus, the next logical step should be having them download the app.
With influencer marketing it is different, because many people will simply be curious and want to learn more. That's why you should direct them to a full-fledged landing page (make your app store download link very visible and placed throughout landing page), where you can give more information and then direct them to the app store download.
From direct, paid advertising (e.g. Instagram ads, FB ads), direct people directly to the app store download page. And from influencer marketing and social media marketing I'd direct them to a landing page.
My reason being is that with FB ads and such, a click on the ad signals strong intent to act. Thus, the next logical step should be having them download the app.
With influencer marketing it is different, because many people will simply be curious and want to learn more. That's why you should direct them to a full-fledged landing page (make your app store download link very visible and placed throughout landing page), where you can give more information and then direct them to the app store download.