There are three reasons to have a spare ball:
To have a ball that goes straight for getting the 10 or 7 pin, or any other spare where straight would be an advantage.
To save wear and tear on your strike ball.
To save time by not having to wait for your ball to come back in order before shooting the spare.
If throwing straight is your top priority, go with polyester a.k.a. plastic. Reactive resin and urethane are also plastic but if you ask for plastic in the pro shop they will probably suggest one of the polyester balls. Even pros who can throw a reactive ball straight by changing their release will switch to plastic to ensure that the ball goes straight.
My preference is for my spare ball to be drilled so it feels the same as my strike ball. I also like it to be the same weight.
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