KR>Foam question

[Alexander Birca (RMD)]

        OK guys, it is again me :-)
I had browsed Aircraft Spruce site, it is really good place. 
The question is, there are two sort of foam polystyrene based, STYROFOAM ­ 
SMALL CELL
and POLYSTYRENE ­ LARGE CELL . 
Here I have only one option, STYROFOAM ­ SMALL CELL. Is it good or not? What 
type 
is used more often by you or what is your choice?

Thanks,
Alex Birca