Looking to purchase an Orbi for home and need a wireless connection to my shop

Thats kind of pushing the range of wifi when you're trying to go that far. I'd shoot for the better system because it'll give you a wider backhaul (1700mbps versus 866mbps). That way if you're connection isn't as good/strong, maybe it'll have enough bandwidth to still work. And worst case scenario, if it doesn't work, you can still use the ethernet as backhaul option. 

Just make sure that the units aren't set where the metal roof or other metalic objects, hvac can block the signal. Ideally, both of them placed in a window with line of sight would be the best.