Well, lets see, Thunder Mountain at Disneyland is pretty cool lookin. I also think Revolution at SFMM is great because of the setting and picturesque loop. I also think Psyclone looks great but the ride plain sucks.
I may not know for sure the best looking but I know the ugliest. That award goes to MAGNUM FORCE. It's hideous, admit it. Second place goes to Flashback at SFMM.
In my opinion themeing and landscape have alot to do with what makes a coaster look great. Something so many unfortunately, do not have.
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"Remember, push down, then pull up."