Even at minimal flow, Lodore will be boatable. Deso seems to have a wider channel and seems like it needs a bit higher flow than Lodore for a good run, so even if Lodore's flowing at 850 (minimum) and Deso's at 1200, Lodore's probably still the better run.
Add that to more spectacular scenery, & better rapids and you shouldn't have any trouble making up your mind. There's a good reason Dino permits are as rare as dinosaurs and that there's a high cancellation rate on Deso...
Have a good trip!
Nothing in the world is more yielding and gentle than water. Yet it has no equal for conquering the resistant and tough. The flexible can overcome the unbending; the soft can overcome the hard. - Lao Tse