I would prefer to pick my site.  With a 34' TT I am not comfortable showing up and hoping that all the big sites aren't taken by tent campers.  We make our reservations 11 months out so with a site specific system i would be assured I can show up at 5pm on a Friday afternoon and not worry about what is left.  In order to move to this system though I suggested in the survey that VA state parks post photos of each site on the campground like the COE does.  Makes picking sites much easier.