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Hi Leo,
I have both Stellarium and SkySafari. I teach nightscape photography courses and recommend it to students wanting an astroplanetarium on the cheap. For a telescopic astronomer and especially if you want to do wireless remote goto control of a telescope, spend the money on SkySafari.
If you want cheap and are willing to put up with slightly clunky, go Stellarium which only costs a few dollars.
Although both the user interfaces look similar, I find SkySafari a much better user experience. I can't really put it into words, it's just easier and more intuitive and smoother to use.
I don't know if it will run on your old tablet. Mine runs perfectly well on my 2017 iPad mini running an up to date iOS(operating system). I run each version of Sky Safari for about 2-3 years, then update when it's on an astronomical event special (eclipses, comets, meteor showers) usually for USD20.
Joe
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