Tomb Kings and Beastmen

The draw for the first two rounds of Summer Incursion has been posted on The Warhammer Forum, and my Ogre Kingdoms have been drawn against Tomb Kings and Beastmen.  Both of these armies allow my Ogres to take an additional 250 points.  So what to take?  

I have the option of two units of two Leadbelchers, or a unit of two Leadbelchers and a unit of  three Bulls with additional hand Weapons, or a Hunter with Beastkiller, or a Hunter with Seigebreaker.

Against Tomb Kings I think my best bet is probably the Hunter with Seigebreaker auto hits and D6 wounds should make a mess of some chariots. I have seen this Tomb Kings army at Gobstyks earlier in the year and it has a bucket load of chariots, so tempted with the Hunter.  Also we have the Bullgorger cast on my three units of Ironguts for smashing chariots, should be fun.  Could the Butcher with his immune to poison tackle the swarms, may give it a go?

Against Beastmen again I am tempted with the Hunter with Seigebreaker or may be the two units of two Leadbelchers.  Depends on how many chariots I will be facing.

I haven't played against Tomb Kings or Beastmen with my Ogre Kingdoms yet, so the first two games should be fun.