Both are very similar but once they made the pros play on lanes treated to make them harder than the average league bowler,
and with the new balls, a league bowler can get a higher score than the pros, people stopped watching it thinking they could do better.
However, they can't on those floor patterns.
It has, though become a major international sport...and the superstars here are treated like matinee idols in some parts of the world.
(and the money is better overseas for them.)
When they went to the exempt tour, cut the number of games per tourney, and changed the balls, it made it harder for the ones they wanted to be on TV to make the finals like they used to. It backfired on them.
What is interesting now is that it is privately owned and operated by one company.
Imagine if one owner owned all the baseball teams.