The screenshot app only needs to have the computer enable the feature. After that it works standalone unless you turn the phone off. When it is turned on again you need some computer to enable it again. I seldom turn the phone completely off. Perhaps that reviewer was using an older version, or some devices it does not work in the way it is meant to. You could contact the developer for confirmation if you are still thinking about Android.
3G is very useful. On gigs I have had to download lyrics for singers who spontaneously want to sing a song they have forgotten some of the lyrics to, or picking up an iReal b chart when I do not have it and someone wants to play it (etc.) The size of an iPad is much better for viewing charts. I use my Android phone with iReal b if playing piano (it is near my eyes) but if playing sax, flute (etc.) I prefer iPad as I am further away from the music stand.
iPad gives me access to scanned PDFs if I need notation. And I use Scorch for Sibelius files giving me my charts in any key (there is a transpose option.) There are some great apps for musicians on it.
Post me some questions if you need help with your decision.
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