I think spinach is one of the better green leafy vegges. I always thought broccoli was the be-all end-all, but I realized it's only because my Mom made me eat it because it was good. I think it was just because it was cheap at the time.
So far as versatility, spinach can be chopped small and thrown in any cooked dish at the very very end of cooking. You probably won't taste it, unlike broccoli which has more of a noticable texture and flavour - for better or worse depending on what you're eating.