I can't speak for other tablets as I use an iPad. IPads might be more expensive to buy but you get free uploads of the operating software whenever they are available. I bought a used iPad 2 on ebay. That cost as much as an android tab. It has been brilliant.
I use iReal Pro as well. Really good for practicing jazz and other styles available too. I have a tuner too, Guitar Tuna, which has the ability to tune guitars 4, 5 and six string basses. I also use Cubasis to record. Endless multi tracks with effects and editing.
Amplitube and other apps provide effects which are often great quality. You do have to be aware there is often a very slight delay as the sound works its way through the software.. It's only milliseconds so you can get used to ot quickly.
You can get all the best synths as well for a tiny fraction of the price of a hardware version. Sound quality is second to none.