what's the differences between AParam: P[Type] and var AParam: [Type] in dll import.

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what's the differences between AParam: P[Type] and var AParam: [Type]
in dll import.
eg.
//C declaration:
//WORD DC_Mif_AntiCollision (DWORD *_dwSnr, BYTE _bMode = 1);
function DC_Mif_AntiCollision(var _dwSnr: Dword):WORD;Stdcall;external
'FOX_DC.dll';
function DC_Mif_AntiCollision(_dwSnr:PDword):WORD;Stdcall;external
'FOX_DC.dll';

And which is better. (It's a mifare1 api to operate IC Card Reader)
eg.
var
dword_1: PDWORD;
dword_2: DWORD;
begin
//function DC_Mif_AntiCollision(var _dwSnr:
Dword):WORD;Stdcall;external 'FOX_DC.dll';
GetMem(dword_1, SizeOf(DWORD));
DC_Mif_AntiCollision(dword_1);
DC_Mif_AntiCollision(dword_2);

//function DC_Mif_AntiCollision(_dwSnr:PDword):WORD;Stdcall;external
'FOX_DC.dll';
DC_Mif_AntiCollision(@dword_2);
//TODO: which one is better???
end;
which one is better, and why?

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