What Fidelity investment is best to choose for 401K?

I was contributing to Fidelity ® Growth Company Commingled Pool Class 3 with %100 as a part of my Microsoft 401K plan, but it's going down a lot. What do you guys use now? Which one is better? Fidelity ® Growth Company Commingled Pool Class 3 or Vanguard Russell 1000 Growth Index Trust? #401K #fidelity