If you want to squeeze 800 ISO out of these films, I would recommend Tetenal Emofin, which is a 2-bath developer. A few years ago I abandoned Emofin in favour of home-mixing Barry Thornton's 2-bath formula, for which I rate both these films at 650 ISO.
I agree with the comments about lack of shadow and highlight detail. If you can't coax these out with your scanner, make your comparison with a hand lens from the negatives.
Here is one of each, with the relevant detail, all scanned from 35mm with minimal sharpening.
TriX Emofin detail.jpg
HP5 BT 2 bath.jpg
HP5 BT 2 bath detail.jpg