So which of the following lots of units would be more effective?

Lot 1
Dreadknight GM (hammer, psycannon & psilencer )

5 x strikes

Dreadknight ( incinerator )

Lot 2

5 x Death knights

1 x extra Black knight

5 x hellblasters

1 x DA Libarian on bike

Main army is DA black knights, sammael, 2 x dark talons, 7 x scouts and a LR of some variant.

Thoughts?