This. I am an OpenSUSE user and for me it is the best distro overall (polished, great infrastructure: BuildService, ...). The user/group management is very annoying though. I ended up writing my own scripts to support this as the command line tools do not even have any such option. Once I brought this up in the forums. Unfortunately, reactions were quite negative. Please make this an option (even if it's only on the command line).

In terms of capabilites Qt and GNUstep/Cocoa are equivalent (roughly). The beauty of ObjC (the language underlying GNUstep/Cocoa), however, is its simplicity yet power which dwarfs C++ quite substantially in terms of ergonomics. If you are not familiar with ObjC you can best compare it with Java. As a matter of fact the Java environment is quite inspired by OPENSTEP which was developed jointly by NeXT and Sun, after which Sun moved to Java and eventually dropped OPENSTEP (for no good reason ;).