Says "Sorry, this voucher cannot be used with this deal."?
Horses for courses. I have an S9 now which I'm happy with, much more than I remember the last time I used an Android handset, it's very good all round - I use an iPhone as my other phone. I had the XZ1 Compact before and was also happy with that. But the S10 has the extra camera that will be useful and is a similar size to the S9, I find the curved edge displays annoying but I will have to live with them.
I think you're missing a trick. Having had an in screen finger print sensor on a Mate 20 Pro, I prefer the regular capacitive type. I prefer flat screens , and again having experienced a big 6.4" screen I prefer the smaller and lighter handsets like my current S8 Your requirements may well be different to mine, but to me the S10e is the pick of he bunch. I wish they'd gone one step further though and fitted an LCD, and not oled. It would be the perfect phone for me then.
I wish they'd do similar deal on EE for the same price.
I am undecided. That Note 9 on EE deal the other day looks good to me too though the S10e just feels like 'the poor man's S10', no matter how they try and pitch it - same way as I'd never be happy with the iPhone XR. I think the telephoto lens is useful too though.