I'm not sure if I am allowed to make suggestions, but a box with S905 chip is regarded as better, but you can't get that, you will probably only be able to get S905X.
I have a Beelink Mini III with S905, Gearbest do a Beelink MiniIII S905X
Ok, thanks for the pointers.
Gearbest are sending me a a replacement box for £22 but I get to keep the existing box.