Leagues
Leagues are one of the best ways to help your game. On top of that. there are many very nice people who play in the Leagues. Once you start up making friendships. You can always find a game with those people. All this adds up to taking your game to the next level.
When you play tournaments it seems like everyone is out for themselves. There is pressure there which will help you learn to control those feeling inside you but if you lose. Who cares, you are only hurting yourself.
On the other hand. The pressure in the Leagues is totally a different type of pressure. Now, not only are you playing for yourself but you are playing for your Team & friends. Makes a difference. It is good to experience both type of situations. I enjoy the Leagues so much more b/c of the friendships.
Give it a try and let us know how things turn out for you.