The Quidditch league isn't really followed in the story so it isn't known who the best team is.
In 1994, Ireland won the Quidditch world cup, without having caught the snitch due to their highly skilled chasers. Bulgaria came in second place.
In 2002, Egypt won with Bulgaria coming in second place.
In 2014, Bulgaria won the cup with Brasil as the runner up.
Harry plays Quidditch for Gryffindor, which is one of the Hogwarts houses.
Bulgaria.Bulgaria.Bulgaria.Bulgaria.
The Chasers.
Harry Potter played for the Gryffindor Quidditch team. Harry stayed on the team until his sixth year, when he left Hogwarts. He was picked to be captain in his sixth year.
Cho Chang
Harry plays Quidditch for Gryffindor, which is one of the Hogwarts houses.
Bulgaria.Bulgaria.Bulgaria.Bulgaria.
The Chasers.
Harry Potter played for the Gryffindor Quidditch team. Harry stayed on the team until his sixth year, when he left Hogwarts. He was picked to be captain in his sixth year.
Cho Chang
first year
Harry Potter plays the game of wizard chess in the first book/movie. He plays the sport of Quiditch. His position is the seeker.
Chaser
It will be easy provided you can fly on a broomstick.
Victor Krum
Charlie Weasley was the captain of Gryffindor Quidditch team. He was so good he could have played for England, but instead went to work with dragons in Romania.
Harry Potter plays 'The Seeker' in the Gryffindor Quidditch House Team. His number is '7', and as Seeker, he is required to catch the 'Golder Snitch', which is caught provides the Seeker's team with 150 points and ends the game.