Depends what you mean by better. The 17 degree deadrise will cut through the waves better than the 21. However the 21 will plane faster and will be more stable at rest. So better is dependant on the use you are planning.
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An acute angle
Between 15 and 20 degrees...
An acute angle is an angle less than 90°. So an angle of 17° is an acute angle.
17
2700 degrees