XC Mountain Bike: aluminum full susp OR carbon hardtail?

[mcneese.chad]

Some existing discussion:

Hardtail vs Full Suspension MTB

If you had your choice… 19 lb compliant Hardtail, or 22 lb 100mm dual suspension for Xc , and Xc marathon 50-75 milers. What would you pick and why? Assuming groupset etc all the same. And also that each can lockout the suspension via handlebar lever.