It is hard to compare all the Disney parks in the world. Each park has its pros and cons. "Better" is very subjective. 
Disneyland in Anaheim was the original, great park, but also very congested and they have not all shows are available every day. 
Disneyworld in Orlando is the biggest, so most to offer, but the Florida heat and humidity is a thing. There is less to do (in my opinion) than if you Los Angeles and San Diego nearby. I am not a beach person so Disneyworld is the most interesting about Florida.
Disneyland Paris is beautiful with some interesting rides, but some people find the French rude, it's a different culture. (I am biased because I am from Europe and Paris is my home park) 
Disneyland Tokyo is a world on its own, I find it hard to describe. But Japanese culture is very different and influences things like queuing, lotteries for shows, long lines. 
Disneyland Hong Kong is a manageable park with a laid back atmosphere. It is the smallest park. 
Disneyland Shanghai is the newest park and rides like Pirates of the Caribbean is world class. But crowds can be huge, especially during Chinese holidays.
If I would rank them: 
-Orlando
- Paris
- Anaheim
- Hong Kong
- Shanghai
- Tokyo. 
If this is your very first Disney park, where you are from etc. I would pick Hong Kong as a way to dip your toe in the water.