It seems like most anglers that buy a PA 12 have 2 primary reasons for buying the 12' version. Transport in the bed of a pickup and storage seem to be the reasoning most use to purchase the 12 footer.
The price difference in the two is minimal at original purchase (only about $250)...I prefer the extra storage in back and the larger hatch up front since I like to attach my reliable kill bag on the front hatch.
Yes the PA is big and heavy...but it's like sitting in a a big old luxury sedan...I can spend all day in that big Vantage seat.