Going to the cinema is ... than watching TV. (exciting)
more exciting
Harry Potter is ... book of all. (interesting)
the most interesting
Surfing is ... than swimming, (difficult)
more difficult
Sharks are ... than dolphins. (dangerous)
more dangerous
Emma is ... girl in our class. (beautiful)
the most beautiful
Your example: sushi - pizza
...
What's the most delicious food for you?
...
What's the most interesting lesson for you?
...
What's the most boring lesson for you?
...
Your example: reading books - playing video games
...
Monday was ... day of all the week. (boring)
the most boring
Pizza is ... than hot dogs. (delicious)
more delicious
Football is ... sport in my country. (popular)
the most popular
What's the most difficult lesson for you?
...