Nemesis -front for the view and back for the sheer intensity (personally the back row trumps it but I do love that view.)
Oblivion - I'm tied to the big boy seat so don't really get many options, but would love to do the edge seats.
Rita - never done front seat but hoping to in a couple of weeks, otherwise I don't mind where
Spinball - I love the weight to be seriously unbalanced so you have no idea how the spin will take you and the ride becomes something else so I'll see if I can sit behind two skinny peeps.
Air - again kinda tied to the bigger seats but I have done front, though not really noticed much difference as I tend to look down and slightly ahead so it's effectively all front row.
13 - the best seat is as far back as you can go, that pull over the lift hill is fantastic and you almost mitigate the effects of the trims
Blade can only be done in the back row otherwise there's no point lol.
Smiler -the numerous times I rode I generally ended up in the front seat, which was a great experience, however I've been curious about the back row, does that add anything to it?
Hex back row tend to go to the left but either is fine.