Whatever works best for you and the conditions you're bowling on. Don't be afraid to experiment.
From personal experience, when the pros started throwing straight at most of their spares, my reaction was "bah, who needs to do that?". Me, Mr. Know-It-All was quickly proven wrong when I started bowling tournaments across more lane conditions and different bowling centers and started missing simply 1-pin pickups.
The advantages of each method (help me out if I miss something gang, I'm not Mr. Know-It-All anymore...)
1. Hooking for spares
PROS: you can use the "forgiveness" in the lane condition to make spares on less than perfect shots .. CONS: On difficult or unknown lane conditions, you miss easy spares due to unforseen or unpredictable ball reactions
2. Straight at 'em
PROS: you can set up a "system" of where to stand and where to throw that you can use anywhere on any condition. You are unaffected by lane conditions.. CONS: no "forgiveness" from the lane conditions. If you miss your mark, you generally miss your spare.
On Edit - BTW, don't feel that you must use one or the other method. I generally hook the balls at my spares on my home house and typical house shots, but throw straight at my spares as soon as I go anywhere else.
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(c) Copied Right! 2003 Knarly Stuff Inc.
Edited on 12/24/2003 1:21 PM