Hmmm... I guess the favorite things about my penis would be:
1: The hardness... I love the way it gets VERY hard when I'm super aroused.
2: The size... I admit that mine is small. But I really like the fact that I at least won't be causing a petite girl too much discomfort with the size of my penis.
3: Sentitivity.. Jr. is very sensitive and responsive. He is very easy to please, I'd say.
As for my partner's... Well, I don't have one currently. I choose not to disclose too much information regarding my ex-girlfriend's pussy for her sake, but I'll just say hers was gorgeous.