I'd recommend you to check your market's needs, meet buyers, get in touch with people interested in buying machines and see what they need and/or want.
Also, offering them different miners (in stock) and with pre-order might attract more people to buy from you.
Also, where are you from if I may know?
im from Spain and i thought that people from the us dont pay tariffs for shippings from europe but if its not that way at least people from europe can buy me tariff free
favebook i thought preorders were worse because mining gear market is full of scams and even having miners in stock i assume is going to be hard to get a good reputation
Actually, as NotFuzzyWarm said, US doesn't care where you ship from, tariffs are always there and that should be same for all (or almost all (read 95%)) of countries. Idk where you heard that people from Europe can buy you tariff free. Maybe in EU something can be sent tariff free, but not WHOLE Europe is EU.
Pre-orders can be sketchy, but once you build up your reputation you can start taking pre-orders. I've already got people in my country who pre-order new gear over me (for various reasons).