For the sake of simplicity I would use the simplest to install and most robust compiler in U++ Windows installer.

I think that first time user needs simplicity and to see that all examples compile and work just out of the box, although it would require more time to compile than other options. In the same installer or in the download page I would put two options:
- The first one: install and run (preferred)
- The second one, for advanced users, would go to the place where compiler directories are searched and selected.