I personally like to watch alternate break, at a high level. Mistakes are more punishing, more pressure to hold your break and win. It also leads to more hill hill/ closer matches, which is exciting for me as a viewer. If two players are on (usually at a high level) you see tight close hill/hill matches all the time. If a player gets blown out in alternate break, they deserve to lose anyway, as they're not performing very well.
When I play I don't have a preference, I'm good with either or. But I do enjoy watching alternate break better.
When I play I don't have a preference, I'm good with either or. But I do enjoy watching alternate break better.