As one who has sold nad shipped over 5,000 items on eBay and shipped almost every package, shipping methods are very important to me, since it determines the marketability of my sales and my bottom line and profit margin.
The shipping "paradigm" changes all the time and the choices are not always based on logic. prior to the last two postal rate changes, I was abale to offer shipping of some packages of up to 4 pounds by air to the UK for as little as $6. Selecting the right package, I could save as much as $20.
One seller shipped a package to me from Colorado to South Carolina for $7 by Parcel Post. I could have done the same by Priority Mail for $4.75.
In the case of a x-box shipped 90-200 miles, UPS would have been the best option.
I've shipped 70 pounds of lead sinkers to Hawwaii from South Carolina to Hawaii for $9.25 by Priority Mail. UPS would have cost $120.
Go figure.