This is kind of obvious as NetBeans and Solaris are both Sun products.
I desire to use Eclipse but find that the differences in the UI between the Windows/Mac versions and the Solaris version unacceptable.
By using the Motif library some things such as “wheel-mouse” and even something as simple as “mouse-button-click” have substantively different outcomes.
The Wheel-mouse events do not work, and you must keep mouse buttons depressed to access menus, even the main menu.
It is basically unusable.
Netbeans has a much more consistent UI experience between the different operating systems. Right-Click always brings a context-sensitive menu, and in the same way.
So my conclusion is; Solaris -> Netbeans, Any other OS -> Eclipse.