Decide whether you need capture or editing
A native camera app can be useful when you want to shoot through a live viewfinder and commit to a mood while taking the photo. A browser editor is often better when you already have an image and want to compare several treatments without installing anything.
Neither workflow is automatically better. The wrong choice is the one that makes you fight the tool before you can see whether the look suits your photo.
Compare the controls that change the result
Look for a meaningful difference between presets, a way to reduce intensity and a before-and-after view. Crop ratios, date stamps, grain and frames are supporting decisions; they should not hide a weak base color grade.
Also check whether the tool explains its file types and export behavior. A retro effect is only useful if the downloaded image keeps enough quality for the place where you plan to share it.
Use privacy as a real comparison point
A tool that processes a selected photo in the browser can reduce the need to send the original to a processing server. That does not make every privacy concern disappear, but it gives you a concrete behavior to understand.
For any app or site, read the privacy page, check whether an account is required and avoid uploading sensitive images until you know how the product handles them. A good alternative is defined by trust as much as by color.