Personally I'd take rear seats, and live with queue - if you have the economy hire car.
Reason : The 2/3 trips I've taken this time of year on that flight, the VS15 can arrives after lots of other flights from both Virgin and others (there is an earlier VS flight (VS027?), and a BA flight from memory. This means by the rear of plane on VS15, the hire-desks may have run out of both econ and mid-sized cars. I've got a full-sized rental free on each occasion - though they were insistent I needed a bigger car at check in each time! If it was the earlier flight I'd pick front of plane every time
Just a thought - depends on how critical getting out of airport is to you really - as mentioned being late can have advantages at MCO occasionally.