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square timing sprockets VS. round timing sprockets

so i need to know because i have both sets
and my belt died yesterday
which one is better square or round sprockets ?
also i noticed the holes in the sprockets
i think those are used to speed up or retard the cam's? right?
if so whats the best set up? the round edged one has 3 while the square edged one has 5
my supra is an 84 so im just wandering which one is the best
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