I just like the look better of the color matched top. Also, i've never had the matching top before, so that pushes me in that direction as well. Its really personal preference, go with what you think looks better. There are plenty of pics of both in this forum.
I'm a fan of both, it just depends on the color and the overall Jeep. The only scenario I don't like is when a Jeep has painted fenders and a black top. Just looks like it's incomplete and a mismatch to me.
Ya, I like the black hard top as well. It's the traditional Jeep "look" and I really like the contrast it creates with the body color. I entertained the idea for about a second of getting the Rubicon in white with the white top, but all I could picture was a big white marshmallow riding on 4 big black off road tires! :-D Hahaha! Not that there's anything wrong with big white marshmallows... I guess I just prefer the "smore" look, white Marshmallow in the middle with the darker cookie on top and bottom. Oh geez, what have I done, now I have a terrible hankerin for a Smore! :-D
For me the painted fenders and top are for the Sahara... the black top and fenders are for the Rubicon. Even with my black Rubi, I got the non-painted black top. Just looks more rugged and less luxury SUV-ish. But my previous JK was a black Sahara Altitude with everything painted, and loved that too. They're both good looks just go with what you like!