It is important with tablets to understand their "app stores".
"Apps" are small programs (Applications), many free, written by people all over the world to run on tablets. There are literally hundreds of thousands of "apps" for tablets.
Now Apple have their own app store, and Andrioid have their own app store as well.
But if you have an Apple iPad you can only download programs from the Apple app store.
And if you have an Android tablet you can only download programs from the Android app store.
Also note some "cheap" tablets dont allow you to download from the app store at all.
And also some tablets (like Blackberry I believe) dont run android so you cant download from the Apple OR Android app store.
When apps become available people usually write for the Apple app store first (because there are so many iPads & iPhones) then the write for the Android App store second.
So as an example if you go to the Daily Telegraph page you see there is a Daily Telegraph for the iPad. But if you look at the bottom of the page you see it says "Telegraph mobile apps for iPhone and Android" so they do them for both.
So if you are really keen on a particular app then check it is available for the platform (Apple or Andriod) before you buy a tablet.
Here is the Telegraph web page to show what I mean
http://www.telegraph.co.uk/apps/#