Alpha for Night Widow: Musc or Agility

Hi Guys
My Night widow is close to hitting 50.
I was wondering what the general consensus was as to what Alpha most usually take. Im considering Agility and Musc at the moment. Which of the two would be better for a night widow?

Probably agility. You'll get benefits from every category it boosts. Musculature is pretty much for the Damage and end mod, the latter already being in Agility.

Use Cardiac if you plan on running lots of toggles, otherwise Musculature.

I'm not very fond of Agility on a Widow as building for defense is easy enough. I prefer going for Cardiac + Rebirth for survivability, or(/and) Musculature + Ageless for damage.

Muscles and Ageless if you have a good amount of uniques, set bonuses, and sets that offer a good variety of end / rech reduction along with damage / acc, Cardiac and Agility if you're still getting there.

However Agility does help push you over the iTrial Softcap to a level where if you get debuffed, you still have enough of a buffer to be safe.

Why not work on damage with hybrid? Just a question, there must be a reason.