Originally Posted by
flybie
... Anyone knows if it’s a huge difference between economy plus and economy premium seats on that particular flight and route? United charges a hefty fare on the economy premium and more affordable on the economy plus such as exit row. ...
Assuming you are familiar with E+,
see
Premium Plus (Premium Economy) seats and Experience is learn more about PremPlus.
Going to Guam per se is not going to bring much difference to the E+ vs PremPlus discussion
Note PremPlus is sold in three fare class, R is the cheapest, A is the middle and O is the most expensive
A another factor when consider an upgrade is purchased PremPlus enhances your upgrade priority to Polaris seats.