This is an oblique response. It is all a huge great scam! This is a two LG and one Samsung family, the two LGs different models. We have friends with Apples. An Apple costs more. Apart from that, as long as we are not talking a '€42' type tablet, there is so little between them really it seems rather overblown what the 'experts' all say. My one perhaps takes a microsecond longer for applications to open than the others but by my standards it is pretty instant and all of the responses I would expect are the same. So, when I did my homework before buying and became bewildered by science I ended up looking at what I was willing to spend, putting that price bracket up in Amazon, Priceminster and so on and then taking a chance. I am very happy with what I have. For practical reasons I have a phone separately, which is a G3 model whereas the three G4s in the household have problems I do not have.
It is almost a stick a pin in it and take that thing. People who 'know' have tried to persuade me otherwise, but then I wonder why they need to pay more than double for something that is basically the same and if it is faster then the human brain isn't responsive enough to actually see the difference.
No help, but perhaps just to prepare you for the expertise that may well be heading in your direction.