USPS, it never gave me a choice. It was 6 dollars plus tax, so I said why not as they didn't give me free shipping and great thing I wasn't given a choice or else it would get here longer than USPS.
I have the same sentiments as well. Ordered on June 11, choosing USPS hoping for a faster delivery, and still no change in my order status of "Payment Accepted". I gave a PM to Allen on Discord for an update on my order, he simply replied to me that "we will send you once the SX Pro arrives in USA."
This is frankly quite disappointing, I expected much more from them as they replied to e-mails very promptly before the release of the SX Pro. Maybe the volume of orders is just too much for them to handle, and they rely very much on our patience, which is really running a bit thin.