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I can't quite decide if a Fleshmetal Exoskeleton or a Siegebreaker prince would be better. Strength 8 on the prince lets him do some good instant killing especially when allied with my Nurgle Grotti prince. Normally I'd love a 2+ armor save on a prince but with all the grav around...plus won't enemies be putting their nastiest weapons into him? Then I should probably stick to Nurgle for the super jink right? Has anyone tried these relics on a daemon prince?

Fleshmetal + nurgle + iron arm made for an unstoppable force.
As long as the rest of your list can deal with walkers, should be OK.
Obviously you can't bank on iron arm.

A slaanesh Prince with the axe is a great beatstick versus armour.