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I did the Mathhammer on Claws vs Talons. If you take claws you may as well find the other 15 points for a Trygon.

Screamer-Killer is getting 4+ hits 63.28% of the time.
Claw-fex . . . . is getting 4+ hits 50.00% of the time, 6+ hits 06.25% of the time.
Trygon . . . . . is getting 4+ hits 99.60% of the time, 6+ hits 82.21% of the time.

See all the numbers here.
http://lyracian.blogspot.com/2010/09/mathhammer-for-hive-mind.html