So, the Thagomizers. Gives an extra melee charge, and grants the Amplify subclass node for free. -snip, i was wrong- I don't think the Thagomizers are worth an Exotic slot with those perks, especially in PvP. If I have big, spiky arms, you know what those big, spiky arms would do?
Hurt.
So, my suggestion would be, instead of Amplify and an extra melee charge? Discharge and 50% extra melee damage against Minions of the Darkness. (10% extra melee damage vs. Guardians.)
Or, maybe instead of Amplify increase the melee Overload proc chance by half.
TL;DR
Thagomizers aren't cool enough.
Give them extra melee damage and Discharge as a free perk, or increased Overload proc chance.
[spoiler][i]boy, i made a fool of myself.[/i][/spoiler]
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Skullfort frees up Transfusion being picked allowing you to take a different perk in that column. You also respawn with a melee charge with Skullfort, you don't with Thagomizers. Discharge is too situational. I prefer Amplify.