Differences between Mingw-w64 and TDM-GCC for a simple GDI project

Question

I need to build a simple non-commercial tool (dealing with Windows GDI API) on Win64 for Win64 (no cross compilation). MinGW seems the best option for me.
I have already

Answer 1

This is a late answer, but I have this same question and I was looking for by many hours and this is what I found...

I think that this link can to expand our view of the differences that include every distro, although the recommendation summary is based in their UI framework library (Qt 5)...

http://qt-project.org/wiki/MinGW-64-bit

Answer 2

I've posted a short overview of MinGW / MinGW-w64 / TDM-GCC here: What is the difference between Orwell's MinGW and TDM Dev-C++ versions?

Which is the equivalent now?

It seems, there's no MinGW-W64 version of mingw-get; not sure if this is still valid. However, MinGW-w64 contains a nice installer.

Btw. MinGW-w64 is not just a "64 Bit port of MinGW" - it's more.