Both of them are like expensive devilfish, though.
>2011
>fielding hammerheads
While they are nice for the big blast AV13 and 4+ cover from 12" away. It always seems like people melta/powerfist them to death, in which case you get no cover save anyway.
plus, you can just use Pulse fire or flamer templates to deal with any lightly armored troops coming your way. And if you are concerned about AP 4, Just use missle pods.