I have a six ball roller so I take six whereever I go.
However, for league, I could easily get by with 3 plus a my spare tire. A dull solid,(Cell) a weak pearl(Momentum Swing or Gravity Shift at 4000) and a strong pearl or Hybrid (Virtual Gravity/HyRoad) for instance.
At our house, carry is always an issue. Some nights, certain balls carry better than other. At times you need a more direct, Cell, Temper etc. arcing type shape to the pocket, other times, you need more angular, kinetic, gravity shift, virtual gravity etc. to the pocket in order to kick out the ten pin.
I like to have the extra balls just to change things up at times or to practice with different surface adjustments after league. But when I am serious, I will not change once I make a call, unless the lane tells me that I need to, i.e 7 frames out of 10 in a row 9/ from every conceivable angle.
CC
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Those that can do. Those that can't complain. Pimpin ain't easy, but it's mandatory.
Most things we like, we don't need. Most things we need, we don't like. Don't confuse your likes with your needs.