Got a 1k battle coming up. Chaos vs Dwarfs.

Which is better between:

7 Chaos Knights, Lances, Khorne and Icon of Darkness for -1 to hit with shooting

Or

6 Chosen Knights with full plate and Lances

Or

5 Chosen Knights with Lances, Full Plate, Khorne and full command

All are around 230 to 250 points.