Well the easy answer is the best kind of baseball is the game you are at... but given a choice, and taking the cost into account, would the fans on this site prefer to go to:
A Major League game
B Minor League game
C College game - including summer leagues (ala Cape Cod)
D High School game - including summer travel ball
I have to say that up until about 5 years ago, it was no question for me - a major league game (A).
In the last few years, I find myself drawn more and more to the high school and college games (C + D). I am lucky enough to have a son who is a fine baseball player - and as a result I have travelled with his team all over the country, playing and watching some of the best high schoolers in the country.
I've been to Cape Cod on family vacations, I've been to the 17U WWBA, I've been to Omaha for the CWS two years ago - and consider these times about as much fun as I have ever had at a baseball game.
Given a choice of airplane and game tickets to watch the Giants play the Mets the next 3 nights at Shea - or tickets to watch the 17U WWBA event in Atlanta - I think I would go to Atlanta.
What about the others on this site? What would you prefer?