If you're going with the Punisher, you should put the animus on your Lord.
And as far as I know, Raiders can't take splinter cannons. You might be better off spending the points on just more warriors on the ground with more splinter cannons, but if you insist on having them all mounted, disintigrators are good.
Personally, if you're fighting a horde list, I'd take some Talos'. Their gun and attacks are good for dealing with numbers and they should be pretty safe from anything that doesn't have rending.
And as far as I know, Raiders can't take splinter cannons. You might be better off spending the points on just more warriors on the ground with more splinter cannons, but if you insist on having them all mounted, disintigrators are good.
Personally, if you're fighting a horde list, I'd take some Talos'. Their gun and attacks are good for dealing with numbers and they should be pretty safe from anything that doesn't have rending.