FWIW, my items shipped by Choice were not affected by tariffs and arrived via private courier, not FedEx, UPS, or USPS. From my brief experience, Choice is the cheapest and most predictable shipping option.
That's not to say that the private courier was the best, however. The guy delivered some of my packages to a neighbor 2 doors away... I'm glad my neighborhood is a relatively safe community and was able to retrieve my packages.
As always, YMMV.