which of the different screen sizes do you prefer?
How many different sized are there?
there are three different sizes
Of course I would love the biggest one. However it really depends on how much more it would cost.
i think it is a couple hundred more. i prefer the mini myself
It's easier to read on a big screen. But it's easier to carry a small one around.
that is true. the 5g makes it a little more expensive
But I think it's cheaper than iPhone 10 when the later was first launched. 
that's true. the iphone X was expensive when it came out
How useful is the 5G readiness? It may make more sense to buy iPhone 10.