Speaking from someone who has seen all of them in person (except Hong Kong's), I truly love them all the same. They all have things that are special and unique about them.
Just FYI, the castle in Tokyo Disneyland is almost identical from the outside as WDW Cinderella's castle. (Inside is different though.)
And the castle in Hong Kong is almost identical from the outside as Disneyland's Sleeping Beauty castle in California.
Well I was going to say WDW castle until I saw the piccies-DLP's looks very nice with the surrounding area. I hate to say this, its pratically blaspehmous, but DL's is horrible-I was soooo disappointed when I went, its tiny! It should dwarf everything around it. They made it worse by sticking a great big mountain practically next to it.