I have an application that retrieves some info and give them to user from a certain public website. However, i am not sure whether i should let my app immediately connect to the target website or it should get the info through my web server using a simple PHP script (JSON). Actually I am using Jsoup to get the information and I tried both and they worked perfectly ( immediate and PHP) using Jsoup. However, I have not published my app yet due to the confusion aforementioned.
Use the web service. If your client has logic to parse the HTML, it can break when the web page changes. The web service can absorb this change and make corrections, but your client cannot. Not unless you release another version of your app, and that can be a pain.