Web apps have ways to track users, but users have ways to mitigate this via adblockers and privacy features in their browser. https://coveryourtracks.eff.org/ exists to help users check their own browser fingerprint.

Full apps on the other hand have many more ways to fingerprint users which aren’t as well known, such as “your free storage, your current volume level (to 3 decimal points) and even your battery level (to 15 decimal points)”. (https://www.washingtonpost.com/technology/2021/09/23/iphone-...)

Is one conclusively better than the other? I’m not sure, but web tracking and fingerprinting is still much more studied and users have more countermeasures, including using a different device where the user has more control.