Folding "+" or Non-folding "X" Rear Fins?

[sorter]

+ or X Rear fins??

[PLAIN]http://img124.imageshack.us/img124/2054/c6xxvp3.jpg

Notice the folding rear fins and fact that they are at 45 degrees X relative to the intake.
[PLAIN]http://img208.imageshack.us/img208/363/c602xxxnm5.jpg

But clearly the rear fins r "+"

Now provided that former missile is oldy with respect to the latter one; I am confused at this
A design progression where the "x" fins didn't work out so they changed to non-folding "+" fins which probably give more range (less drag?, less weight?) but take up more space?

 

[Danger]

I don't really know much about missiles, but one thought comes to mind. If the latter version has moveable control surfaces on the tail-planes, which I can't determine from the photo, a cruciform rather than X configuration would be easier to engineer. Individual elevators and rudders take less co-ordination than multiple stabilators.

 

[sorter]

talking about Drag parameter only; wht you suggest; either + or X configuration will have more than the other??

 

[boneh3ad]

There shouldn't be any notable difference in drag unless the fins are different shapes.

 

[sorter]

Guys,, but their must be some difference b/w choosing + over x

 

[boneh3ad]

Either ease of control as stated before or because they may get the fins out of the wake of the wings and/or intake. Those are the only things that jump to mind.