I have one of each, and my male is definately much more happy go lucky. We joke that he is our 'special' dog....he is quite accident prone, and if something could happen to him, it will happen, poor guy. LOL!!
My female knows exactly what is going on everywhere, the location of every single squirrel and bird and rabbit and cat within a 10 mile radius, she hears and see all. LOL!!
For instance, when we're out for our walks, he's the one with his ears back, head down and just trucking along enjoying the fact that he's out walking, my female on the other hand has her head up, ears pricked and her eyes scanning and taking everything in.
She's also the one that goes out and does what we jokingly refer to as her perimeter check before she pees and then comes back in.
opcorn:
Now, having said that, I wouldn't then say that every female is like her and every male like him. Each dog has their own distinct personality.
Good Luck!