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I plan on running 3 units of 10 noise marines with IoE in rhinos and a CC slaanesh lord on steed with either bikes or spawn retinue.

Do you think that I should take sonic weapons for range or a CCW for assaults?
also, which would be better with the lord? Bikes with MoS with IoE or MoS spawn?

Spawn don't have grenades, so giving them MOS doesn't help.

For a slanessh themed army, I'd go with bikes.

Give them all sonics and then maybe close combat weapons depending on how many points you've got over. remember these guys hit at I5 so having that extra attacks always good to have.