Both of those are ambidextrous, so either is a good choice. I say go for the Saunders Pro. It will be faster due to its using bands instead of tubes, and you can make it much faster with a set of aftermarket latex bands like Flatband or Tex-shooter sells. It also folds down to a very compact size.
I only have experience with the old 3070 but it was, for a big-box item, well-made and worked well enough. I don't sell anything but there are top-notch craftsmen on this site turning out exquisite work that is made one at a time and some of them build off your measurements. My gentle suggestion is to pm some of these guys and see what they are capable of. And their prices are extremely reasonable, too.