which is faster: WinApi or C Runtime?

["tjandracom" <wineforum-user@xxxxxxxxxx>]

which is faster in Wine?

WinApi functions such as: CreateFile(), ReadFile(), WriteFile(), CloseFile(), HeapAlloc(), HeapRealloc(), etc.
vs.
C Runtime functions: fopen(), fread(), fwrite, fclose(), malloc(), etc.

if i develop an application to be run in Wine, should i use WinApi functions, or
C Runtime functions?