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I'd also be concerned that the Dell would make upgrading potentially more tricky. See @Ordinata's PSU experiences for example. Reckon on 16GB RAM being a bare minimum for any 3D or video-related stuff these days, particularly if you want to be running other applications simultaneously. Photogrammetry can be very memory intensive.
The processor in either is definitely decent enough and there's no point having the 'K' unless you want to overclock it, something which shouldn't be necessary anyway.
As previously said, forget about the Quadro or AMD equivalents. Completely pointless waste of money, even for most professional applications outside proper full-on CAD.
What photogrammetry software are you using? Both Reality Capture and Photoscan rely heavily on GPU rather than CPU for processing, so the 30% more CUDA cores in a 1080 would definitely be beneficial for that.
Brun-
I checked and the Dell8910 has one 16gb RAM card installed and another 3 slots up to a maximum of 64gb, so should be ok for that.
If just paying an extra £500 for the 1080 I might hang off and see how the 1070 performs in real life usage-most comparisons I've seen are quoting a c.16% difference in favour of the 1080 for rendering which doesn't sound life or death. I think Unity and Autodesk cloud services will also take the strain off anything genuinely meaty.
I've just been using Photoscan as I got a free license through my old Uni that's never expired-it's actually one of the few programs that has run ok on my Mac 2011 powerbook
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@chrisbmx116 @duncs
thanks very much again for the input-a big outlay so good to have reassurance I'm not going to be either stuck with a pig in a poke or alternatively, spunking money up the wall on too much capacity that I won't need/use. Will go with the cheaper Dell and hold some cash back for more RAM if it looks like it needs it.