MingW x Visual Studio compiler

Which is the best compiler mingw 32 or visual studio compiler ?
What are the differences in the exe files, are they smaler, slower, faster ?

First diference i noticed is size of build
msvc: 2.1 GB
gcc: 5.5 GB
for example - lib files:

Code:

---

Name         Extension  Size        Attributes
QtGui.lib    lib        34,541,666  ---A----  
QtGui.prl    prl             1,122  ---A----  
QtGuid.lib   lib        65,311,050  ---A----  
QtGuid.prl   prl             1,116  ---A----  
 
Name         Extension  Size        Attributes
libQtGui.a   a          18,215,764  ---A----
libQtGui4.a  a           7,926,574  ---A----
libQtGuid.a  a         469,069,964  ---A----
libQtGuid4.a a           8,841,350  ---A----

---

this is how i configured build:

Code:

---

configure -platform win32-msvc2005 -static -debug-and-release -fast -qt-sql-sqlite -no-qt3support -vcproj
configure -platform win32-g++ -static -debug-and-release -fast -qt-sql-sqlite -no-qt3support

---

and commented demos and examples in projects.pro

i do not know why i such a huge diference beetween build size.

one more thing, it's seems that gcc is slower (judgeing on qt build time).

another thing is that AFAIK mingw can not use MMX, SSE(2) and other CPU optimizations, so the libraries are probably slower a little bit...