Not either or, because most of the stuff amazon sells is from china. They are just like TCP/IP for a purchase from china, with buffering in the US, chunking, r

Not either or, because most of the stuff amazon sells is from china. They are just like TCP/IP for a purchase from china, with buffering in the US, chunking, retransmit and guaranteed delivery. You can probably be more efficient with UDP from china, but you could lose packets.